WO2010023996A1 - Backlight device and display device provided with the same - Google Patents

Backlight device and display device provided with the same Download PDF

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Publication number
WO2010023996A1
WO2010023996A1 PCT/JP2009/059038 JP2009059038W WO2010023996A1 WO 2010023996 A1 WO2010023996 A1 WO 2010023996A1 JP 2009059038 W JP2009059038 W JP 2009059038W WO 2010023996 A1 WO2010023996 A1 WO 2010023996A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
backlight device
light emitting
Prior art date
Application number
PCT/JP2009/059038
Other languages
French (fr)
Japanese (ja)
Inventor
正一 駒野
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to CN2009801265261A priority Critical patent/CN102089568B/en
Priority to JP2010526592A priority patent/JP5101701B2/en
Priority to RU2011111716/07A priority patent/RU2475671C2/en
Priority to EP09809651.4A priority patent/EP2306071A4/en
Priority to US13/054,574 priority patent/US8579490B2/en
Priority to BRPI0917131A priority patent/BRPI0917131A2/en
Publication of WO2010023996A1 publication Critical patent/WO2010023996A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/009—Positioning aspects of the light source in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133322—Mechanical guidance or alignment of LCD panel support components
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to a backlight device and a display device including the same, and more particularly to a sidelight type backlight device and a display device including the same.
  • Patent Document 1 discloses a sidelight type (also referred to as an edge light type) backlight structure (backlight device) including a light guide plate, an LED light source and a reflective structure disposed on the side of the light guide plate. Is disclosed.
  • the light guide plate is formed so that the light incident surface and the light emitting surface are orthogonal to each other. And the light radiate
  • a sidelight type backlight device including a light guide plate having an inclined surface inclined with respect to a light emitting surface is known.
  • FIG. 10 is a cross-sectional view showing the structure of a display device having a sidelight type backlight device according to a conventional example.
  • a display device 501 including a sidelight type backlight device 510 according to a conventional example includes a display panel 502, an upper polarizing plate 503 and a lower polarizing plate 504 sandwiching the display panel 502, and a display panel.
  • a backlight device 510 disposed on the back side (lower side) of 502 and a metal frame 505 covering the back side of the backlight device 510 are provided.
  • the display panel 502 includes two transparent substrates 502a and 502b.
  • a liquid crystal (not shown) is sealed between the two substrates 502a and 502b.
  • a driving IC (Integrated Circuit) 506 and an FPC (Flexible Printed Circuits) 507 are attached to the front surface of the substrate 502a.
  • the FPC 507 is also arranged on the back side of a frame 515 described later by being bent at a predetermined position.
  • the backlight device 510 includes a plurality of LEDs 511, a light guide plate 512 having a light incident surface 512a on which light from the LEDs 511 is incident, a plurality of optical sheets 513 arranged to face the light exit surface 512b of the light guide plate 512, It includes a reflection sheet 514 disposed on the back side of the light guide plate 512 and a frame-like frame 515 that houses them.
  • the plurality of LEDs 511 are fixed to the FPC 507 via the solder layer 516 and are disposed so as to face the light incident surface 512 a of the light guide plate 512.
  • the portion of the FPC 507 disposed on the back side of the frame 515 is bonded to the frame 515 by an adhesive member 517 made of double-sided tape or the like.
  • the light guide plate 512 is formed so that the light incident surface 512a and the light emitting surface 512b are substantially orthogonal to each other.
  • an inclined surface 512c is formed between the light incident surface 512a and the light emitting surface 512b of the light guide plate 512 with an angle ⁇ 101 (for example, 6 °) with respect to the light emitting surface 512b.
  • the light guide plate 512 is formed such that the portion on the light incident surface 512a side (LED 511 side) is thicker than the portion on the light emitting surface 512b side.
  • the light guide plate 512 is disposed at a predetermined distance from an adhesive member 518 described later.
  • the plurality of optical sheets 513 includes a diffusion sheet 513a, a lower lens sheet 513b, and an upper lens sheet 513c.
  • the frame 515 is adhered to the display panel 502 by an adhesive member 518 made of double-sided tape or the like.
  • the light guide plate 512 is formed such that the light incident surface 512a side (LED 511 side) portion is thicker than the light emission surface 512b side portion. More light emitted from the LED 511 can be incident on the light guide plate 512.
  • the light guide plate 512 is disposed at a predetermined distance from the adhesive member 518, light incident on the light guide plate 512 is emitted to the adhesive member 518 side and absorbed by the adhesive member 518. Can be suppressed. Note that when the light guide plate 512 is bonded to the adhesive member 518, the light incident on the light guide plate 512 is easily emitted from the portion of the light guide plate 512 that is bonded to the adhesive member 518. Then, the light emitted from the light guide plate 512 is absorbed by the adhesive member 518. For this reason, when the light guide plate 512 is bonded to the adhesive member 518, the light use efficiency is lowered, and the luminance of the display panel 502 is lowered.
  • the light guide plate 512 is formed with the inclined surface 512c inclined with respect to the light emitting surface 512b. A part of the light is emitted from the inclined surface 512c to the display panel 502 side. For this reason, there is an inconvenience that the luminance of the area around the LED 511 of the display panel 502 is higher (larger) than the luminance of the area other than the area around the LED 511. That is, there is a problem that the uniformity is lowered.
  • the light guide plate 512 since the light guide plate 512 is disposed at a predetermined distance from the adhesive member 518, the light guide plate 512 moves in the thickness direction. For this reason, there is an inconvenience that the entire light guide plate 512 may be inclined with respect to the display panel 502 during assembly. As described above, when the entire light guide plate 512 is inclined with respect to the display panel 502, the luminance of the portion of the display panel 502 on the LED 511 side becomes high (the luminance of the portion on the side opposite to the LED 511 is low), or There is an inconvenience that the brightness of the portion on the LED 511 side is low (the brightness on the side opposite to the LED 511 is high). For this reason, there exists a problem that a uniformity falls more.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a backlight device capable of suppressing a decrease in uniformity and a display device including the backlight device. Is to provide.
  • a backlight device is a sidelight type backlight device, comprising a light emitting element, a light incident surface on which light from the light emitting element is incident, and A light guide plate including a light output surface for emitting incident light to the display panel side, and an optical sheet disposed to face the light output surface of the light guide plate, and between the light incident surface and the light output surface of the light guide plate
  • the light guide plate is formed such that the thickness of the portion on the light incident surface side is greater than the thickness of the portion on the light output surface side.
  • a restricting member that has light shielding properties and restricts movement of the light guide plate in the thickness direction of the light guide plate is disposed in front of the light incident surface side portion of the light exit surface of the light guide plate.
  • the light-incident light is incident on the light guide plate by disposing a light-shielding regulating member in front of the light incident surface side portion of the light exit surface. Even when part of the light is emitted from the inclined surface to the display panel, the light emitted from the light guide plate can be prevented from reaching the display panel by the light-blocking regulating member. Thereby, it can suppress that the brightness
  • the regulating member that regulates the movement of the light guide plate in the thickness direction of the light guide plate in front of the light incident surface side portion of the light exit surface of the light guide plate.
  • the light incident surface is formed by forming the light guide plate so that the portion on the light incident surface side is thicker than the portion on the light emission surface side.
  • the area of can be made larger.
  • the light guide plate is formed such that the portion on the light incident surface side is thicker than the portion on the light output surface side. Since the thickness of the portion on the light emitting surface side can be reduced, the thickness of the entire backlight device can be reduced.
  • the backlight device further includes a frame that houses the light emitting element, the light guide plate, and the optical sheet, and an adhesive member that fixes the display panel to the frame. It is glued to. If comprised in this way, it can suppress easily that a control member moves with respect to a flame
  • the backlight device preferably further includes a resin frame that houses the light emitting element, the light guide plate, and the optical sheet, and the regulating member is integrally formed with the frame. If comprised in this way, it can suppress easily that a control member moves with respect to a light-guide plate. Further, the number of parts can be reduced and the assembling process can be simplified as compared with the case where the regulating member is formed separately from the frame.
  • the restricting member is fixed to the optical sheet. If comprised in this way, while being able to suppress a control member moving with respect to an optical sheet, the positional accuracy with respect to the light-guide plate of a control member can be improved.
  • the optical sheet is configured to include a diffusion sheet disposed so as to be in contact with the light emitting surface of the light guide plate, and the restriction member is formed on the diffusion sheet. It may be fixed.
  • the restriction member is disposed in front of the light incident surface and the light exit surface of the light guide plate, and a wide sheet member disposed in front of the light exit surface of the light guide plate. It is formed by adhering to a narrow sheet member. If comprised in this way, a regulating member can be formed so that it may have an L-shaped section, for example, only by bonding a wide sheet member and a narrow sheet member. Accordingly, the regulating member is easily formed to have an L-shaped cross section as compared with a case where the regulating member is formed to have an L-shaped cross section by resin molding using a mold, for example. can do.
  • the light guide plate is bonded even when an adhesive member is disposed in front of the light guide plate, for example. Bonding to the member can be suppressed. Thereby, since it can suppress that the light which injected into the light-guide plate is radiate
  • the light guide plate is bonded to the adhesive member, the light incident on the light guide plate is easily emitted from the portion of the light guide plate that is bonded to the adhesive member. The light emitted from the light guide plate is absorbed by the adhesive member. For this reason, the utilization efficiency of light falls and the brightness
  • the backlight device in which the restriction member is formed of a wide sheet member and a narrow sheet member, preferably, the backlight device further includes a frame that houses the light emitting element, the light guide plate, and the optical sheet, and the frame is a wide sheet member of the restriction member Has a function of suppressing movement in the surface direction of the wide sheet member. If comprised in this way, it can suppress easily that a control member moves to a surface direction.
  • the regulating member has a function of reflecting light. If comprised in this way, since the light radiate
  • the backlight device preferably further includes a frame that houses the light emitting element, the light guide plate, and the optical sheet, and an adhesive member that fixes the display panel to the frame, and at least a part of the adhesive member. Is disposed in front of the light incident surface of the light guide plate, and the distance between the light exit surface of the light guide plate or the optical sheet and the regulating member is between the light incident surface side portion of the light guide plate and the adhesive member. Less than the distance. If comprised in this way, since it can control that the distance between the light emission surface of a light guide plate or an optical sheet, and a regulation member becomes large, it is that a light guide plate moves to the thickness direction of a light guide plate. It can be easily regulated. Thereby, since it can suppress easily that the whole light-guide plate inclines with respect to a display panel, it can suppress easily that a uniformity degree falls.
  • the light emitting element is filled in the light emitting chip, the package main body having a concave portion for housing the light emitting chip, and the concave portion of the package main body so as to cover the light emitting chip.
  • the light incident surface of the light guide plate is formed up to a position ahead of the recess of the package body. If comprised in this way, more light radiate
  • a display device includes the backlight device having the above configuration and a display panel illuminated by the backlight device. If comprised in this way, the display apparatus which can suppress that a uniformity will fall can be obtained.
  • the present invention it is possible to easily obtain a backlight device and a display device including the backlight device capable of suppressing a decrease in uniformity.
  • FIG. 1 is an exploded perspective view illustrating a structure of a liquid crystal display device including a backlight device according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view illustrating a structure of a liquid crystal display device including the backlight device according to the first embodiment of the present invention illustrated in FIG. 1. It is the top view which showed the structure of the flame
  • FIG. 6 is an exploded perspective view illustrating a structure of a liquid crystal display device including a backlight device according to a second embodiment of the present invention.
  • FIG. 1 is an exploded perspective view illustrating a structure of a liquid crystal display device including a backlight device according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view illustrating a structure of a liquid crystal display device including the backlight device according to the first embodiment
  • FIG. 6 is a cross-sectional view illustrating a structure of a liquid crystal display device including a backlight device according to a second embodiment of the present invention illustrated in FIG. 5.
  • FIG. 6 is a plan view showing a structure of a frame of the backlight device shown in FIG. 5. It is the disassembled perspective view which showed the structure of the liquid crystal display device provided with the backlight apparatus by 3rd Embodiment of this invention.
  • FIG. 9 is a cross-sectional view illustrating a structure of a liquid crystal display device including a backlight device according to a third embodiment of the present invention illustrated in FIG. 8. It is sectional drawing which showed the structure of the display apparatus provided with the sidelight type backlight apparatus by an example of the past.
  • the structure of the liquid crystal display device 1 including the backlight device 10 according to the first embodiment of the present invention will be described with reference to FIGS.
  • the liquid crystal display device 1 is an example of the “display device” in the present invention.
  • the liquid crystal display device 1 including the backlight device 10 according to the first embodiment of the present invention is used in an electronic device such as a mobile phone.
  • the liquid crystal display device 1 includes a liquid crystal display panel 2, an upper polarizing plate 3 and a lower polarizing plate 4 (see FIG. 2) sandwiching the liquid crystal display panel 2, and the back side of the liquid crystal display panel 2. It is comprised by the backlight apparatus 10 arrange
  • the liquid crystal display panel 2 is an example of the “display panel” in the present invention.
  • the liquid crystal display panel 2 includes a transparent AM substrate (active matrix substrate) 2a, and a transparent counter substrate 2b disposed opposite to the AM substrate 2a and having a smaller area than the AM substrate 2a. It is out. Further, liquid crystal (not shown) is sealed between the AM substrate 2a and the counter substrate 2b.
  • the liquid crystal display panel 2 functions as a display panel when illuminated by the backlight device 10.
  • the driving IC 6 and the FPC 7 are attached to the front surface of the AM substrate 2a.
  • the FPC 7 is also arranged on the back side of the frame 16 described later by being bent at a predetermined position. Further, as shown in FIG. 1, a connector member 8 for electrical connection with the outside is attached to the end of the FPC 7.
  • the liquid crystal display panel 2 is bonded (fixed) to the front surface of a frame 16 to be described later by an adhesive member 19 to be described later made of double-sided tape or the like.
  • the backlight device 10 is a sidelight type (edge light type) backlight device as shown in FIG. 2, and a plurality of LEDs 11 and light from the LEDs 11 are incident thereon.
  • a light guide plate 12 having a light incident surface 12a, a regulating member 13 and a plurality of optical sheets 14 arranged to face the light emitting surface 12b of the light guide plate 12, a reflection sheet 15 arranged on the back side of the light guide plate 12, And a resin frame 16 for housing them.
  • the LED 11 is an example of the “light emitting element” in the present invention.
  • the plurality of LEDs 11 are fixed to the FPC 7 via the solder layer 17.
  • the plurality of LEDs 11 are arranged at a predetermined pitch in the A direction (see FIG. 3) so as to face the light incident surface 12 a of the light guide plate 12.
  • the LED 11 includes a blue light emitting chip 11a, a package main body portion 11c having a concave portion 11b for housing the blue light emitting chip 11a, and a filler 11d filled in the concave portion 11b of the package main body portion 11c so as to cover the blue light emitting chip 11a. And is composed of.
  • the filler 11d is made of a transparent resin including a fluorescent material.
  • the blue light emitting chip 11a is an example of the “light emitting chip” in the present invention.
  • the portion arranged on the back side of the frame 16 of the FPC 7 is bonded to the back surface of the frame 16 by an adhesive member 18 made of double-sided tape or the like.
  • the adhesive member 18 includes one FPC adhesive portion 18a and three metal frame adhesive portions 18b, 18c and 18d.
  • the FPC bonding portion 18a bonds the frame 16 and the FPC 7 together.
  • the three metal frame bonding portions 18b, 18c and 18d bond the frame 16 and the metal frame 5.
  • the light guide plate 12 is arranged at a predetermined distance from an adhesive member 19 described later.
  • the light guide plate 12 is formed so that the light incident surface 12a and the light emitting surface 12b extend in a direction substantially orthogonal to each other.
  • the light guide plate 12 has a function of emitting light from the LED 11 from the light incident surface 12a and emitting the light from the light emitting surface 12b toward the liquid crystal display panel 2 side (C1 direction).
  • an inclined surface 12c inclined by an angle ⁇ 1 (for example, 12 °) with respect to the light emitting surface 12b is formed between the light incident surface 12a and the light emitting surface 12b of the light guide plate 12. That is, the light guide plate 12 is formed so that the portion on the light incident surface 12a side (the LED 11 side) is thicker than the portion on the light emitting surface 12b side. Specifically, the portion on the light incident surface 12a side (LED 11 side) of the light guide plate 12 has a thickness of 0.6 mm, for example, and the portion on the light output surface 12b side has a thickness of 0.42 mm, for example.
  • the light incident surface 12a of the light guide plate 12 is formed to a position ahead (C1 direction) from the concave portion 11b of the package main body portion 11c of the LED 11.
  • the regulating member 13 is white, has a function of reflecting light, and also has a light shielding property.
  • the restricting member 13 is disposed in front (C1 direction) of the LED 11 side (B1 direction side) portion of the light emitting surface 12b of the light guide plate 12.
  • the regulating member 13 includes a wide sheet member 13a disposed in front of the light incident surface 12a, the inclined surface 12c, and the light emitting surface 12b of the light guide plate 12, and the light emitting surface 12b of the light guide plate 12.
  • the narrow sheet member 13b disposed in front of the sheet and the wide sheet member 13a and the adhesive member 13c for bonding the narrow sheet member 13b.
  • the regulating member 13 has an L-shaped cross section.
  • the wide sheet member 13a and the narrow sheet member 13b are made of the same material (for example, resin such as PET (polyethylene terephthalate)) and have the same thickness.
  • resin such as PET (polyethylene terephthalate)
  • the regulating member 13 has a function of regulating the movement of the light guide plate 12 in the thickness direction (C direction) of the light guide plate 12.
  • the wide sheet member 13a (regulating member 13) is bonded (fixed) to an adhesive member 19 described later.
  • the distance (for example, several tens of ⁇ m) between the light emission surface 12b of the light guide plate 12 (a diffusion sheet 14a to be described later of the optical sheet 14) and the narrow sheet member 13b of the regulating member 13 is light incident on the light guide plate 12.
  • the regulating member 13 is formed so as to be smaller than the distance between the portion on the surface 12 a side and the wide sheet member 13 a and the adhesive member 19 of the regulating member 13. This restricts the light guide plate 12 from moving in the thickness direction (C direction).
  • the plurality of optical sheets 14 are disposed so as to be in contact with the light guide plate 12 and are disposed in front of the diffusion sheet 14a (in the C1 direction) having a function of diffusing light and have a function of condensing light.
  • the lower lens sheet 14b and the upper lens sheet 14c are configured.
  • the reflection sheet 15 has a function of reflecting the light emitted from the back surface of the light guide plate 12 and traveling the light guide plate 12 side (C1 direction).
  • the frame 16 houses a plurality of LEDs 11, a light guide plate 12, a plurality of optical sheets 14, and the like. As shown in FIG. 4, the frame 16 has an opening 16a and is formed in a frame shape including long side portions 16b and 16c and short side portions 16d and 16e.
  • the some optical sheet 14 is arrange
  • the light guide plate 12 is also suppressed from moving in the surface direction (A direction and B direction).
  • a regulating member 13 is disposed on the long side portion 16b side of the opening portion 16a.
  • a portion of the opening portion 16a on the long side portion 16b side is formed in substantially the same shape as the wide sheet member 13a of the regulating member 13.
  • frame 16 has a function which suppresses (regulates) that the wide sheet
  • the optical sheet 14 (the lower lens sheet 14b and the upper lens sheet 14c) has a function of suppressing (restricting) the movement of the wide sheet member 13a of the restricting member 13 in the surface direction (B2 direction).
  • the regulating member 13 when assembling the backlight device 10, as shown in FIG. 2, with the light guide plate 12 and the plurality of optical sheets 14 disposed in the opening 16 a of the frame 16, the regulating member 13 is attached to the light guide plate 12. It arrange
  • the long side portion 16 b of the frame 16 suppresses (restricts) the wide sheet member 13 a of the restricting member 13 from moving in the surface direction (A direction and B1 direction).
  • the lower lens sheet 14b and the upper lens sheet 14c of the optical sheet 14 suppress (restrict) the movement of the wide sheet member 13a of the restricting member 13 in the surface direction (B2 direction). In this way, the regulating member 13 is positioned. Then, the regulating member 13 is fixed by adhering the adhesive member 19 to the frame 16 and the regulating member 13 in a state where the regulating member 13 is positioned.
  • an adhesive member 19 that bonds (fixes) the frame 16 and the liquid crystal display panel 2 has an opening 19a, long sides 19b and 19c, short sides 19d and 19e, It is formed in the frame shape which consists of.
  • the long side portion 19b has a larger width than the long side portion 16b of the frame 16. Moreover, the long side part 19b is arrange
  • the light-shielding regulating member 13 is disposed in front of the light incident surface 12a side (LED 11 side) of the light emitting surface 12b of the light guide plate 12 (in the C1 direction).
  • the light emitted from the light guide plate 12 is prevented from reaching the liquid crystal display panel 2.
  • it can.
  • it can suppress that the brightness
  • the light guide plate is arranged in the thickness direction (C direction) of the light guide plate 12 in front of the light incident surface 12a side (LED 11 side) portion of the light output surface 12b of the light guide plate 12.
  • the restricting member 13 that restricts the movement of the light guide plate 12 it is possible to suppress the light guide plate 12 from moving in the thickness direction.
  • luminance of the part by the side of LED11 of the liquid crystal display panel 2 is high (the brightness
  • the brightness of the portion of the liquid crystal display panel 2 on the LED 11 side is low (the brightness of the portion on the opposite side of the LED 11 is high).
  • the light guide plate 12 is formed such that the portion on the light incident surface 12a side is thicker than the portion on the light exit surface 12b side, thereby making the light incident surface 12a.
  • the area of can be made larger. Thereby, more light emitted from the LED 11 can be incident on the light guide plate 12, so that the luminance of the liquid crystal display panel 2 can be improved.
  • the light guide plate 12 is formed such that the portion on the light incident surface 12a side is thicker than the portion on the light exit surface 12b side. Since the thickness of the portion on the light emitting surface 12b side can be reduced, the thickness of the entire backlight device 10 (liquid crystal display device 1) can be reduced.
  • the regulating member 13 by fixing (adhering) the regulating member 13 to the adhesive member 19, it is easy for the regulating member 13 to move with respect to the frame 16, the light guide plate 12, and the like. Can be suppressed.
  • the regulating member 13 is formed by adhering the wide sheet member 13a and the narrow sheet member 13b, thereby forming the wide sheet member 13a and the narrow sheet member 13b.
  • the regulating member 13 can be formed to have an L-shaped cross section.
  • the restriction member 13 has an L-shaped cross section more easily than a case where the restriction member 13 is formed to have an L-shaped cross section by, for example, resin molding using a mold. Can be formed.
  • the wide sheet member 13 a of the restricting member 13 in front of the light incident surface 12 a and the light emitting surface 12 b of the light guide plate 12, it is possible to suppress the light guide plate 12 from adhering to the adhesive member 19. it can.
  • the utilization efficiency of light falls and the brightness
  • the light guide plate 12 is bonded to the adhesive member 19, the light incident on the light guide plate 12 is easily emitted from the portion of the light guide plate 12 that is bonded to the adhesive member 19. Then, the light emitted from the light guide plate 12 is absorbed by the adhesive member 19. For this reason, the utilization efficiency of light falls and the brightness
  • the long side portion 16b of the frame 16 is restrained (restricted) from moving the wide sheet member 13a of the restricting member 13 in the surface direction (A direction and B1 direction).
  • the backlight apparatus 10 can be made easy to assemble.
  • the light reflectance of the regulation member 13 is increased compared to the case where the regulation member 13 is black, for example. be able to.
  • the utilization efficiency of light can be improved, the brightness
  • the light incident surface 12a of the light guide plate 12 is formed to a position ahead of the recess 11b of the package body 11c, so that more light is emitted from the LED 11.
  • the light can be incident on the light incident surface 12 a of the light guide plate 12.
  • luminance of the liquid crystal display panel 2 can be improved more.
  • the wide sheet member 13a and the narrow sheet member 13b are made of the same material and have the same thickness. Thereby, since the wide sheet member 13a and the narrow sheet member 13b can be formed using the same material (sheet member), manufacturing cost can be reduced.
  • the luminance of 9 points (points P1 to P9 in FIG. 1) on the liquid crystal display panel 2 (upper polarizing plate 3) is measured, and the maximum value of the luminance of 9 points (points P1 to P9) is measured.
  • the uniformity was calculated by dividing by the minimum value.
  • the average value, the maximum value, and the minimum value of the calculated 30 uniformity values are shown in Table 1 below.
  • the liquid crystal display device according to the example has improved uniformity (closer to 1) than the liquid crystal display device according to the comparative example.
  • the average value, the maximum value, the minimum value, and the standard deviation of the uniformity of the liquid crystal display device according to the example are about 1.13, about 1.19, about 1.10, and about 0.03, respectively. there were.
  • the average value, maximum value, minimum value and standard deviation of the uniformity of the liquid crystal display device according to the comparative example were about 1.21, about 1.37, about 1.12 and about 0.06, respectively. .
  • the light blocking plate 13 is disposed in front of the light incident surface 12a side (LED 11 side) portion of the light emitting surface 12b of the light guide plate 12, thereby providing the light guide plate 12 with the light shielding property. Even when a part of the incident light was emitted from the inclined surface 12 c to the liquid crystal display panel 2 side, it was possible to suppress the light emitted from the light guide plate 12 from reaching the liquid crystal display panel 2. Thereby, it was possible to suppress the luminance of the portion around the LED 11 of the liquid crystal display panel 2 from becoming higher (larger) than the luminance of the portion other than the portion around the LED 11. As a result, it is considered that the uniformity is improved.
  • the light guide plate 12 is restricted from moving in the thickness direction (C direction) in front of the light incident surface 12a side (LED 11 side) portion of the light output surface 12b of the light guide plate 12.
  • the regulating member 13 By arranging the regulating member 13, the light guide plate 12 can be prevented from moving in the thickness direction.
  • the light guide plate 12 can be suppressed from moving in the thickness direction, the amount of light incident on the light guide plate 12 can be suppressed from varying. Thereby, it is considered that the standard deviation of the uniformity is small (variation is small).
  • the brightness of the liquid crystal display device according to the example was improved as compared with the liquid crystal display device according to the comparative example.
  • the average value of the luminance of the liquid crystal display device according to the example was about 296 (cd / m 2 ).
  • the average value of the luminance of the liquid crystal display device according to the comparative example was about 292 (cd / m 2 ).
  • the light emitted from the inclined surface 12c of the light guide plate 12 is reflected by using the restricting member 13 by forming the restricting member 13 to have a function of reflecting light. Therefore, the light emitted from the inclined surface 12c of the light guide plate 12 can be incident again on the light guide plate 12. As a result, the light utilization efficiency can be improved, and it is considered that the luminance of the liquid crystal display panel 2 can be increased.
  • the resin frame 116 has two openings 116a and 116b.
  • the frame 116 is formed in a frame shape including long side portions 116c and 116d and short side portions 116e and 116f.
  • a restriction part 116 g is integrally formed on the long side part 116 c of the frame 116, and the opening part 116 a and the opening part 116 b are formed by the restriction part 116 g. Is partitioned.
  • the regulating portion 116g is an example of the “regulating member” in the present invention.
  • the restricting portion 116g is disposed opposite to the light emitting surface 12b of the light guide plate 12 as in the first embodiment.
  • the regulating portion 116g (frame 116) is white, has a function of reflecting light, and also has a light shielding property.
  • the regulation part 116g has a function which regulates that the light-guide plate 12 moves to the thickness direction (C direction) of the light-guide plate 12 similarly to the said 1st Embodiment.
  • the regulating portion 116g has a distance (for example, several tens of ⁇ m) between the light emitting surface 12b (diffusion sheet 14a) of the light guide plate 12 and the regulating portion 116g on the light incident surface 12a side of the light guide plate 12. It is formed to be smaller than the distance between the portion and the adhesive member 19. This restricts the light guide plate 12 from moving in the thickness direction (C direction).
  • the regulating portion 116g is formed to have a rectangular cross section. For this reason, in 2nd Embodiment, the control part 116g is not arrange
  • FIG. The restricting portion 116g may be formed to have an L-shaped cross section, and a portion of the restricting portion 116g may be disposed in front of the light incident surface 12b side portion of the light guide plate 12. In this case, the opening 116 a may not be formed in the frame 116.
  • the remaining structure of the second embodiment is the same as that of the first embodiment.
  • the regulating portion 116g is formed integrally with the frame 116, so that the regulating portion 116g is guided as compared with the case where the regulating portion 116g is formed separately from the frame 116.
  • the movement with respect to the optical plate 12 or the like can be easily suppressed.
  • the number of parts can be reduced, and the assembly process can be simplified.
  • the regulating member 213 is fixed to the end of the diffusion sheet 14a on the LED 11 side (B1 direction) ( Have been glued).
  • the regulating member 213 is configured by a sheet member 213a made of a resin such as white PET and an adhesive member 213b, and has a rectangular cross section.
  • the adhesive member 213b is made of a double-sided tape or the like and has a function of fixing the sheet member 213a to the diffusion sheet 14a.
  • the diffusion sheet 14a in which the regulating member 213 is fixed at a predetermined position is prepared. Then, in a state where the light guide plate 12 is disposed in the opening 16 a of the frame 16, the plurality of optical sheets 14 (diffusion sheets 14 a) are disposed in front of the light emitting surface 12 b of the light guide plate 12 (C1 direction). At this time, since the restriction member 213 is fixed to the diffusion sheet 14a, the movement of the restriction member 213 in the surface direction (A direction and B direction) is suppressed (restricted).
  • the regulating member 213 since the regulating member 213 is formed to have a rectangular cross section, it is not arranged in front of the light incident surface 12 b side portion of the light guide plate 12. As in the first embodiment, the regulating member 213 is formed to have an L-shaped cross section, and a part of the regulating member 213 is disposed in front of the light incident surface 12b side portion of the light guide plate 12. Also good.
  • the regulating member 213 has a function of regulating the movement of the light guide plate 12 in the thickness direction (C direction) of the light guide plate 12 as in the first embodiment.
  • the distance between the regulating member 213 and the adhesive member 19 is the distance between the portion on the light incident surface 12a side of the light guide plate 12 and the adhesive member 19. It is formed to be smaller than that. This restricts the light guide plate 12 from moving in the thickness direction (C direction).
  • the remaining structure of the third embodiment is the same as that of the first embodiment.
  • the regulation member 213 by fixing the regulating member 213 to the diffusion sheet 14a, the regulation member 213 can be prevented from moving with respect to the diffusion sheet 14a, and the regulation member 213 can be prevented from moving.
  • the positional accuracy with respect to the light guide plate 12 can be improved.
  • the diffusion sheet 14a in which the restriction member 213 is fixed at a predetermined position is prepared, and the diffusion sheet 14a is used as the light of the light guide plate 12. It arrange
  • the display device is applied to a liquid crystal display device.
  • the present invention is not limited thereto, and may be applied to a display device other than the liquid crystal display device.
  • the liquid crystal display device is used for an electronic device such as a mobile phone.
  • the present invention is not limited to this, and the liquid crystal display device may be used for an electronic device other than the mobile phone.
  • an LED including a blue light emitting chip is used as the light emitting element.
  • the present invention is not limited thereto, and an LED including a light emitting chip other than the blue light emitting chip may be used.
  • a light emitting element other than an LED may be used.
  • the regulating member may be formed in a relatively high reflectance such as silver. Alternatively, it may be formed in a relatively low reflectance, for example, black. Further, the regulating member may be formed so as not to have a function of reflecting light.
  • a regulating member is other than L-shaped or rectangular shape.
  • it may be formed to have a trapezoidal cross section.
  • the regulating member may be formed by bonding a wide sheet member having a width and a narrow sheet member.
  • the regulating member (regulating portion) is disposed at a predetermined distance from the light guide plate and the diffusion sheet.
  • the regulating member is the adhesive member 19.
  • the present invention is not limited to this, and the regulating member (regulating portion) may be arranged so as to be in contact with the light guide plate, the diffusion sheet, and the adhesive member 19.
  • the restriction member is fixed to the diffusion sheet.
  • the present invention is not limited to this, and the restriction member may be fixed to the upper lens sheet, the lower lens sheet, or the like.
  • the inclined surface of the light guide plate is formed so as to be inclined by 12 ° with respect to the light emitting surface.
  • the present invention is not limited to this, and the inclined surface of the light guide plate You may form so that it may incline more than 12 degrees or may be small with respect to an output surface.
  • Liquid crystal display device (display device) 2 Liquid crystal display panel (display panel) 10, 110, 210 Backlight device 11 LED (light emitting element) 11a Blue light emitting chip (light emitting chip) 11b Recess 11c Package body 11d Filler 12 Light guide plate 12a Light incident surface 12b Light exit surface 12c Inclined surface 13, 213 Restriction member 13a Wide sheet member 13b Narrow sheet member 14 Optical sheet 14a Diffusion sheet 16, 116 Frame 19 Adhesive member 116g Restriction part (regulation member)

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Abstract

Provided is a backlight device which can suppress deterioration of uniformity.  The backlight device (10) is provided with an LED (11), and a light guide plate (12) which includes a light incoming surface (12a) and a light outgoing surface (12b).  An inclined surface (12c) which is inclined from the light outgoing surface is formed between the light incoming surface and the light outgoing surface of the light guide plate, and the light guide plate is formed such that the thickness of a portion on the light incoming surface side is more than that of a portion on the light outgoing surface side.  At the front of the portion on the light incoming surface side of the light outgoing surface of the light guide plate, a regulating member (13), which has a light blocking characteristic and regulates shift of the light guide plate in the thickness direction of the light guide plate, is arranged.

Description

バックライト装置およびそれを備えた表示装置Backlight device and display device having the same
　この発明は、バックライト装置およびそれを備えた表示装置に関し、特に、サイドライト型のバックライト装置およびそれを備えた表示装置に関する。 The present invention relates to a backlight device and a display device including the same, and more particularly to a sidelight type backlight device and a display device including the same.
　従来、サイドライト型のバックライト装置が知られている（例えば、特許文献１参照）。 Conventionally, a sidelight type backlight device is known (see, for example, Patent Document 1).
　上記特許文献１には、導光板と、導光板の側方に配置されたＬＥＤ光源および反射構造物とを備えたサイドライト型（エッジライト型とも言う）のバックライト構造体（バックライト装置）が開示されている。 Patent Document 1 discloses a sidelight type (also referred to as an edge light type) backlight structure (backlight device) including a light guide plate, an LED light source and a reflective structure disposed on the side of the light guide plate. Is disclosed.
　このバックライト構造体では、導光板は、光入射面と光出射面とが直交するように形成されている。そして、ＬＥＤ光源から出射した光は、反射構造物に反射されることにより導光板の光入射面に入射し、光出射面から出射される。 In this backlight structure, the light guide plate is formed so that the light incident surface and the light emitting surface are orthogonal to each other. And the light radiate | emitted from the LED light source injects into the light-incidence surface of a light-guide plate by being reflected by a reflective structure, and is radiate | emitted from a light-projection surface.
　また、従来、光出射面に対して傾斜した傾斜面を有する導光板を備えたサイドライト型のバックライト装置が知られている。 Further, conventionally, a sidelight type backlight device including a light guide plate having an inclined surface inclined with respect to a light emitting surface is known.
　図１０は、従来の一例によるサイドライト型のバックライト装置を備えた表示装置の構造を示した断面図である。従来の一例によるサイドライト型のバックライト装置５１０を備えた表示装置５０１は、図１０に示すように、表示パネル５０２と、表示パネル５０２を挟み込む上偏光板５０３および下偏光板５０４と、表示パネル５０２の背面側（下側）に配置されたバックライト装置５１０と、バックライト装置５１０の背面側を覆うメタルフレーム５０５とを備えている。 FIG. 10 is a cross-sectional view showing the structure of a display device having a sidelight type backlight device according to a conventional example. As shown in FIG. 10, a display device 501 including a sidelight type backlight device 510 according to a conventional example includes a display panel 502, an upper polarizing plate 503 and a lower polarizing plate 504 sandwiching the display panel 502, and a display panel. A backlight device 510 disposed on the back side (lower side) of 502 and a metal frame 505 covering the back side of the backlight device 510 are provided.
　表示パネル５０２は、透明な２つの基板５０２ａおよび５０２ｂを含んでいる。この２つの基板５０２ａおよび５０２ｂの間には、図示しない液晶が封入されている。また、基板５０２ａの前面には、駆動用ＩＣ（Ｉｎｔｅｇｒａｔｅｄ　Ｃｉｒｃｕｉｔ）５０６およびＦＰＣ（Ｆｌｅｘｉｂｌｅ　Ｐｒｉｎｔｅｄ　Ｃｉｒｃｕｉｔｓ）５０７が取り付けられている。このＦＰＣ５０７は、所定の位置で折り曲げられることにより、後述するフレーム５１５の背面側にも配置されている。 The display panel 502 includes two transparent substrates 502a and 502b. A liquid crystal (not shown) is sealed between the two substrates 502a and 502b. Further, a driving IC (Integrated Circuit) 506 and an FPC (Flexible Printed Circuits) 507 are attached to the front surface of the substrate 502a. The FPC 507 is also arranged on the back side of a frame 515 described later by being bent at a predetermined position.
　バックライト装置５１０は、複数のＬＥＤ５１１と、ＬＥＤ５１１からの光が入射される光入射面５１２ａを有する導光板５１２と、導光板５１２の光出射面５１２ｂに対向配置された複数の光学シート５１３と、導光板５１２の背面側に配置された反射シート５１４と、これらを収納する枠状のフレーム５１５とを含んでいる。 The backlight device 510 includes a plurality of LEDs 511, a light guide plate 512 having a light incident surface 512a on which light from the LEDs 511 is incident, a plurality of optical sheets 513 arranged to face the light exit surface 512b of the light guide plate 512, It includes a reflection sheet 514 disposed on the back side of the light guide plate 512 and a frame-like frame 515 that houses them.
　複数のＬＥＤ５１１は、半田層５１６を介してＦＰＣ５０７に固定されているとともに、導光板５１２の光入射面５１２ａに対向するように配置されている。 The plurality of LEDs 511 are fixed to the FPC 507 via the solder layer 516 and are disposed so as to face the light incident surface 512 a of the light guide plate 512.
　ＦＰＣ５０７のフレーム５１５の背面側に配置された部分は、両面テープなどからなる接着部材５１７により、フレーム５１５に接着されている。 The portion of the FPC 507 disposed on the back side of the frame 515 is bonded to the frame 515 by an adhesive member 517 made of double-sided tape or the like.
　導光板５１２は、光入射面５１２ａと光出射面５１２ｂとが略直交するように形成されている。また、導光板５１２の光入射面５１２ａと光出射面５１２ｂとの間には、光出射面５１２ｂに対して角度θ１０１（例えば６°）傾斜した傾斜面５１２ｃが形成されている。すなわち、導光板５１２は、光入射面５１２ａ側（ＬＥＤ５１１側）の部分が、光出射面５１２ｂ側の部分よりも厚みが大きくなるように形成されている。 The light guide plate 512 is formed so that the light incident surface 512a and the light emitting surface 512b are substantially orthogonal to each other. In addition, an inclined surface 512c is formed between the light incident surface 512a and the light emitting surface 512b of the light guide plate 512 with an angle θ101 (for example, 6 °) with respect to the light emitting surface 512b. In other words, the light guide plate 512 is formed such that the portion on the light incident surface 512a side (LED 511 side) is thicker than the portion on the light emitting surface 512b side.
　また、導光板５１２は、後述する接着部材５１８から所定の距離を隔てて配置されている。 The light guide plate 512 is disposed at a predetermined distance from an adhesive member 518 described later.
　複数の光学シート５１３は、拡散シート５１３ａ、下レンズシート５１３ｂおよび上レンズシート５１３ｃによって構成されている。 The plurality of optical sheets 513 includes a diffusion sheet 513a, a lower lens sheet 513b, and an upper lens sheet 513c.
　フレーム５１５は、両面テープなどからなる接着部材５１８により、表示パネル５０２に接着されている。 The frame 515 is adhered to the display panel 502 by an adhesive member 518 made of double-sided tape or the like.
　このバックライト装置５１０では、上記のように、導光板５１２は、光入射面５１２ａ側（ＬＥＤ５１１側）の部分が、光出射面５１２ｂ側の部分よりも厚みが大きくなるように形成されているので、ＬＥＤ５１１から出射した光を、より多く、導光板５１２に入射させることが可能である。 In the backlight device 510, as described above, the light guide plate 512 is formed such that the light incident surface 512a side (LED 511 side) portion is thicker than the light emission surface 512b side portion. More light emitted from the LED 511 can be incident on the light guide plate 512.
　また、導光板５１２の光出射面５１２ｂ側の部分の厚みを小さくすることが可能であるので、バックライト装置５１０（表示装置５０１）全体の厚みを小さくすることが可能である。 Further, since it is possible to reduce the thickness of the light emitting surface 512b side portion of the light guide plate 512, it is possible to reduce the thickness of the entire backlight device 510 (display device 501).
　また、バックライト装置５１０では、導光板５１２は、接着部材５１８から所定の距離を隔てて配置されているので、導光板５１２に入射した光が接着部材５１８側に出射し接着部材５１８に吸収されるのを抑制することが可能である。なお、導光板５１２が接着部材５１８に接着している場合、導光板５１２に入射した光は、導光板５１２の接着部材５１８に接着している部分から出射しやすくなる。そして、導光板５１２から出射した光は、接着部材５１８に吸収される。このため、導光板５１２が接着部材５１８に接着している場合、光の利用効率が低下し、表示パネル５０２の輝度が低下する。 In the backlight device 510, since the light guide plate 512 is disposed at a predetermined distance from the adhesive member 518, light incident on the light guide plate 512 is emitted to the adhesive member 518 side and absorbed by the adhesive member 518. Can be suppressed. Note that when the light guide plate 512 is bonded to the adhesive member 518, the light incident on the light guide plate 512 is easily emitted from the portion of the light guide plate 512 that is bonded to the adhesive member 518. Then, the light emitted from the light guide plate 512 is absorbed by the adhesive member 518. For this reason, when the light guide plate 512 is bonded to the adhesive member 518, the light use efficiency is lowered, and the luminance of the display panel 502 is lowered.
特開２００７－４１６０５号公報JP 2007-41605 A
　しかしながら、従来の一例によるバックライト装置５１０を備えた表示装置５０１では、導光板５１２に、光出射面５１２ｂに対して傾斜した傾斜面５１２ｃが形成されているので、導光板５１２に入射した光の一部が、傾斜面５１２ｃから表示パネル５０２側に出射する。このため、表示パネル５０２のＬＥＤ５１１周辺の部分の輝度が、ＬＥＤ５１１周辺以外の部分の輝度に比べて高く（大きく）なるという不都合がある。すなわち、均斉度が低下するという問題点がある。 However, in the display device 501 provided with the backlight device 510 according to the conventional example, the light guide plate 512 is formed with the inclined surface 512c inclined with respect to the light emitting surface 512b. A part of the light is emitted from the inclined surface 512c to the display panel 502 side. For this reason, there is an inconvenience that the luminance of the area around the LED 511 of the display panel 502 is higher (larger) than the luminance of the area other than the area around the LED 511. That is, there is a problem that the uniformity is lowered.
　また、この表示装置５０１では、導光板５１２を、接着部材５１８から所定の距離を隔てて配置しているので、導光板５１２が厚み方向に移動する。このため、組立時などに、導光板５１２全体が表示パネル５０２に対して傾斜する場合があるという不都合がある。このように、導光板５１２全体が表示パネル５０２に対して傾斜すると、表示パネル５０２のＬＥＤ５１１側の部分の輝度が高く（ＬＥＤ５１１とは反対側の部分の輝度が低く）なったり、表示パネル５０２のＬＥＤ５１１側の部分の輝度が低く（ＬＥＤ５１１とは反対側の部分の輝度が高く）なったりするという不都合がある。このため、均斉度がより低下するという問題点がある。 In this display device 501, since the light guide plate 512 is disposed at a predetermined distance from the adhesive member 518, the light guide plate 512 moves in the thickness direction. For this reason, there is an inconvenience that the entire light guide plate 512 may be inclined with respect to the display panel 502 during assembly. As described above, when the entire light guide plate 512 is inclined with respect to the display panel 502, the luminance of the portion of the display panel 502 on the LED 511 side becomes high (the luminance of the portion on the side opposite to the LED 511 is low), or There is an inconvenience that the brightness of the portion on the LED 511 side is low (the brightness on the side opposite to the LED 511 is high). For this reason, there exists a problem that a uniformity falls more.
　この発明は、上記のような課題を解決するためになされたものであり、この発明の目的は、均斉度が低下するのを抑制することが可能なバックライト装置およびそれを備えた表示装置を提供することである。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a backlight device capable of suppressing a decrease in uniformity and a display device including the backlight device. Is to provide.
　上記目的を達成するために、この発明の第１の局面によるバックライト装置は、サイドライト型のバックライト装置であって、発光素子と、発光素子からの光が入射される光入射面、および、入射した光を表示パネル側に出射する光出射面を含む導光板と、導光板の光出射面に対向配置される光学シートとを備え、導光板の光入射面と光出射面との間には、光出射面に対して傾斜する傾斜面が形成されており、導光板は、光入射面側の部分の厚みが光出射面側の部分の厚みよりも大きくなるように形成されており、導光板の光出射面の光入射面側の部分の前方には、遮光性を有するとともに、導光板の厚み方向に導光板が移動するの規制する規制部材が配置されている。 In order to achieve the above object, a backlight device according to a first aspect of the present invention is a sidelight type backlight device, comprising a light emitting element, a light incident surface on which light from the light emitting element is incident, and A light guide plate including a light output surface for emitting incident light to the display panel side, and an optical sheet disposed to face the light output surface of the light guide plate, and between the light incident surface and the light output surface of the light guide plate The light guide plate is formed such that the thickness of the portion on the light incident surface side is greater than the thickness of the portion on the light output surface side. A restricting member that has light shielding properties and restricts movement of the light guide plate in the thickness direction of the light guide plate is disposed in front of the light incident surface side portion of the light exit surface of the light guide plate.
　この第１の局面によるバックライト装置では、上記のように、導光板の光出射面の光入射面側の部分の前方に、遮光性を有する規制部材を配置することによって、導光板に入射した光の一部が傾斜面から表示パネル側に出射した場合にも、遮光性を有する規制部材により、導光板から出射した光が表示パネルに到達するのを抑制することができる。これにより、表示パネルの発光素子周辺の部分の輝度が、発光素子周辺以外の部分の輝度に比べて高く（大きく）なるのを抑制することができる。その結果、均斉度が低下するのを抑制することができる。 In the backlight device according to the first aspect, as described above, the light-incident light is incident on the light guide plate by disposing a light-shielding regulating member in front of the light incident surface side portion of the light exit surface. Even when part of the light is emitted from the inclined surface to the display panel, the light emitted from the light guide plate can be prevented from reaching the display panel by the light-blocking regulating member. Thereby, it can suppress that the brightness | luminance of the part around the light emitting element of a display panel becomes high (large) compared with the brightness | luminance of parts other than the light emitting element periphery. As a result, it is possible to suppress a decrease in uniformity.
　また、第１の局面によるバックライト装置では、上記のように、導光板の光出射面の光入射面側の部分の前方に、導光板の厚み方向に導光板が移動するの規制する規制部材を配置することによって、導光板が厚み方向に移動するのを抑制することができる。これにより、導光板全体が表示パネルに対して傾斜するのを抑制することができるので、表示パネルの発光素子側の部分の輝度が高く（発光素子とは反対側の部分の輝度が低く）なったり、表示パネルの発光素子側の部分の輝度が低く（発光素子とは反対側の部分の輝度が高く）なったりするのを抑制することができる。その結果、均斉度が低下するのを、より抑制することができる。 In the backlight device according to the first aspect, as described above, the regulating member that regulates the movement of the light guide plate in the thickness direction of the light guide plate in front of the light incident surface side portion of the light exit surface of the light guide plate. By arrange | positioning, it can suppress that a light-guide plate moves to the thickness direction. Thereby, since it can suppress that the whole light-guide plate inclines with respect to a display panel, the brightness | luminance of the part by the side of the light emitting element of a display panel becomes high (The brightness | luminance of the part on the opposite side to a light emitting element becomes low). Or the luminance of the portion of the display panel on the light emitting element side is low (the luminance of the portion on the opposite side of the light emitting element is high). As a result, it is possible to further suppress the decrease in the uniformity.
　また、第１の局面によるバックライト装置では、上記のように、導光板を、光入射面側の部分が光出射面側の部分よりも厚みが大きくなるように形成することによって、光入射面の面積をより大きくすることができる。これにより、発光素子から出射した光を、より多く、導光板に入射させることができるので、輝度を向上させることができる。 In the backlight device according to the first aspect, as described above, the light incident surface is formed by forming the light guide plate so that the portion on the light incident surface side is thicker than the portion on the light emission surface side. The area of can be made larger. Thereby, more light emitted from the light emitting element can be made incident on the light guide plate, so that the luminance can be improved.
　また、第１の局面によるバックライト装置では、上記のように、導光板を、光入射面側の部分が光出射面側の部分よりも厚みが大きくなるように形成することによって、導光板の光出射面側の部分の厚みを小さくすることができるので、バックライト装置全体の厚みを小さくすることができる。 In the backlight device according to the first aspect, as described above, the light guide plate is formed such that the portion on the light incident surface side is thicker than the portion on the light output surface side. Since the thickness of the portion on the light emitting surface side can be reduced, the thickness of the entire backlight device can be reduced.
　上記第１の局面によるバックライト装置において、好ましくは、発光素子、導光板および光学シートを収納するフレームと、表示パネルをフレームに固定するための接着部材とをさらに備え、規制部材は、接着部材に接着されている。このように構成すれば、規制部材がフレームや導光板などに対して移動するのを、容易に抑制することができる。 In the backlight device according to the first aspect, preferably, the backlight device further includes a frame that houses the light emitting element, the light guide plate, and the optical sheet, and an adhesive member that fixes the display panel to the frame. It is glued to. If comprised in this way, it can suppress easily that a control member moves with respect to a flame | frame, a light-guide plate, etc.
　上記第１の局面によるバックライト装置において、好ましくは、発光素子、導光板および光学シートを収納する樹脂製のフレームをさらに備え、規制部材は、フレームに一体的に形成されている。このように構成すれば、規制部材が導光板などに対して移動するのを、容易に抑制することができる。また、規制部材をフレームとは別体で形成する場合に比べて、部品点数を削減することができるとともに、組立工程を簡略化することができる。 The backlight device according to the first aspect preferably further includes a resin frame that houses the light emitting element, the light guide plate, and the optical sheet, and the regulating member is integrally formed with the frame. If comprised in this way, it can suppress easily that a control member moves with respect to a light-guide plate. Further, the number of parts can be reduced and the assembling process can be simplified as compared with the case where the regulating member is formed separately from the frame.
　上記第１の局面によるバックライト装置において、好ましくは、規制部材は、光学シートに固定されている。このように構成すれば、規制部材が光学シートに対して移動するのを抑制することができるとともに、規制部材の導光板に対する位置精度を向上させることができる。 In the backlight device according to the first aspect, preferably, the restricting member is fixed to the optical sheet. If comprised in this way, while being able to suppress a control member moving with respect to an optical sheet, the positional accuracy with respect to the light-guide plate of a control member can be improved.
　上記規制部材が光学シートに固定されているバックライト装置において、光学シートを、導光板の光出射面に接するように配置される拡散シートを含むように構成するとともに、規制部材を、拡散シートに固定してもよい。 In the backlight device in which the restriction member is fixed to the optical sheet, the optical sheet is configured to include a diffusion sheet disposed so as to be in contact with the light emitting surface of the light guide plate, and the restriction member is formed on the diffusion sheet. It may be fixed.
　上記第１の局面によるバックライト装置において、好ましくは、規制部材は、導光板の光入射面および光出射面の前方に配置される幅広シート部材と、導光板の光出射面の前方に配置される幅狭シート部材とが接着されることにより形成されている。このように構成すれば、幅広シート部材と幅狭シート部材とを接着するだけで、規制部材を、例えばＬ字状の断面を有するように形成することができる。これにより、規制部材を、例えば金型を用いた樹脂成形により、Ｌ字状の断面を有するように形成する場合に比べて、規制部材を、容易に、Ｌ字状の断面を有するように形成することができる。また、規制部材の幅広シート部材を、導光板の光入射面および光出射面の前方に配置することによって、導光板の前方に、例えば接着部材が配置されている場合にも、導光板が接着部材に接着するのを抑制することができる。これにより、導光板に入射した光が接着部材側に出射し接着部材に吸収されるのを抑制することができるので、光の利用効率が低下し表示パネルの輝度が低下するのを抑制することができる。なお、導光板が接着部材に接着している場合、導光板に入射した光は、導光板の接着部材に接着している部分から出射しやすくなる。そして、導光板から出射した光は、接着部材に吸収される。このため、光の利用効率が低下し、表示パネルの輝度が低下する。 In the backlight device according to the first aspect, preferably, the restriction member is disposed in front of the light incident surface and the light exit surface of the light guide plate, and a wide sheet member disposed in front of the light exit surface of the light guide plate. It is formed by adhering to a narrow sheet member. If comprised in this way, a regulating member can be formed so that it may have an L-shaped section, for example, only by bonding a wide sheet member and a narrow sheet member. Accordingly, the regulating member is easily formed to have an L-shaped cross section as compared with a case where the regulating member is formed to have an L-shaped cross section by resin molding using a mold, for example. can do. In addition, by arranging the wide sheet member of the regulating member in front of the light incident surface and the light emitting surface of the light guide plate, the light guide plate is bonded even when an adhesive member is disposed in front of the light guide plate, for example. Bonding to the member can be suppressed. Thereby, since it can suppress that the light which injected into the light-guide plate is radiate | emitted to the adhesive member side, and is absorbed by the adhesive member, it suppresses that the utilization efficiency of light falls and the brightness | luminance of a display panel falls. Can do. When the light guide plate is bonded to the adhesive member, the light incident on the light guide plate is easily emitted from the portion of the light guide plate that is bonded to the adhesive member. The light emitted from the light guide plate is absorbed by the adhesive member. For this reason, the utilization efficiency of light falls and the brightness | luminance of a display panel falls.
　上記規制部材が幅広シート部材および幅狭シート部材により形成されているバックライト装置において、好ましくは、発光素子、導光板および光学シートを収納するフレームをさらに備え、フレームは、規制部材の幅広シート部材が幅広シート部材の面方向に移動するのを抑制する機能を有する。このように構成すれば、規制部材が面方向に移動するのを、容易に抑制することができる。 In the backlight device in which the restriction member is formed of a wide sheet member and a narrow sheet member, preferably, the backlight device further includes a frame that houses the light emitting element, the light guide plate, and the optical sheet, and the frame is a wide sheet member of the restriction member Has a function of suppressing movement in the surface direction of the wide sheet member. If comprised in this way, it can suppress easily that a control member moves to a surface direction.
　上記第１の局面によるバックライト装置において、好ましくは、規制部材は、光を反射する機能を有する。このように構成すれば、導光板の傾斜面から出射した光を、規制部材を用いて反射させることができるので、導光板の傾斜面から出射した光を、導光板に再度入射させることができる。これにより、光の利用効率を向上させることができるので、表示パネルの輝度を高くすることができる。 In the backlight device according to the first aspect, preferably, the regulating member has a function of reflecting light. If comprised in this way, since the light radiate | emitted from the inclined surface of a light-guide plate can be reflected using a control member, the light radiate | emitted from the inclined surface of a light-guide plate can be incident again on a light-guide plate. . Thereby, since the light use efficiency can be improved, the luminance of the display panel can be increased.
　上記第１の局面によるバックライト装置において、好ましくは、発光素子、導光板および光学シートを収納するフレームと、表示パネルをフレームに固定するための接着部材とをさらに備え、接着部材の少なくとも一部は、導光板の光入射面の前方に配置されており、導光板の光出射面または光学シートと規制部材との間の距離は、導光板の光入射面側の部分と接着部材との間の距離よりも小さい。このように構成すれば、導光板の光出射面または光学シートと規制部材との間の距離が大きくなるのを抑制することができるので、導光板の厚み方向に導光板が移動するのを、容易に規制することができる。これにより、導光板全体が表示パネルに対して傾斜するのを、容易に抑制することができるので、均斉度が低下するのを、容易に抑制することができる。 The backlight device according to the first aspect preferably further includes a frame that houses the light emitting element, the light guide plate, and the optical sheet, and an adhesive member that fixes the display panel to the frame, and at least a part of the adhesive member. Is disposed in front of the light incident surface of the light guide plate, and the distance between the light exit surface of the light guide plate or the optical sheet and the regulating member is between the light incident surface side portion of the light guide plate and the adhesive member. Less than the distance. If comprised in this way, since it can control that the distance between the light emission surface of a light guide plate or an optical sheet, and a regulation member becomes large, it is that a light guide plate moves to the thickness direction of a light guide plate. It can be easily regulated. Thereby, since it can suppress easily that the whole light-guide plate inclines with respect to a display panel, it can suppress easily that a uniformity degree falls.
　上記第１の局面によるバックライト装置において、好ましくは、発光素子は、発光チップと、発光チップを収納する凹部を有するパッケージ本体部と、発光チップを覆うようにパッケージ本体部の凹部に充填される充填材とを含み、導光板の光入射面は、パッケージ本体部の凹部よりも前方の位置まで形成されている。このように構成すれば、発光素子から出射した光を、より多く、導光板に入射させることができる。これにより、表示パネルの輝度をより向上させることができる。 In the backlight device according to the first aspect, preferably, the light emitting element is filled in the light emitting chip, the package main body having a concave portion for housing the light emitting chip, and the concave portion of the package main body so as to cover the light emitting chip. The light incident surface of the light guide plate is formed up to a position ahead of the recess of the package body. If comprised in this way, more light radiate | emitted from the light emitting element can be entered into a light-guide plate. Thereby, the brightness | luminance of a display panel can be improved more.
　この発明の第２の局面による表示装置は、上記構成のバックライト装置と、バックライト装置により照明される表示パネルとを備える。このように構成すれば、均斉度が低下するのを抑制することが可能な表示装置を得ることができる。 A display device according to a second aspect of the present invention includes the backlight device having the above configuration and a display panel illuminated by the backlight device. If comprised in this way, the display apparatus which can suppress that a uniformity will fall can be obtained.
　以上のように、本発明によれば、均斉度が低下するのを抑制することが可能なバックライト装置およびそれを備えた表示装置を容易に得ることができる。 As described above, according to the present invention, it is possible to easily obtain a backlight device and a display device including the backlight device capable of suppressing a decrease in uniformity.
本発明の第１実施形態によるバックライト装置を備えた液晶表示装置の構造を示した分解斜視図である。1 is an exploded perspective view illustrating a structure of a liquid crystal display device including a backlight device according to a first embodiment of the present invention. 図１に示した本発明の第１実施形態によるバックライト装置を備えた液晶表示装置の構造を示した断面図である。FIG. 2 is a cross-sectional view illustrating a structure of a liquid crystal display device including the backlight device according to the first embodiment of the present invention illustrated in FIG. 1. 図１に示したバックライト装置のフレーム、光学シートおよび規制部材の構造を示した平面図である。It is the top view which showed the structure of the flame | frame of the backlight apparatus shown in FIG. 1, an optical sheet, and a control member. 図１に示したバックライト装置のフレームの構造を示した平面図である。It is the top view which showed the structure of the flame | frame of the backlight apparatus shown in FIG. 本発明の第２実施形態によるバックライト装置を備えた液晶表示装置の構造を示した分解斜視図である。FIG. 6 is an exploded perspective view illustrating a structure of a liquid crystal display device including a backlight device according to a second embodiment of the present invention. 図５に示した本発明の第２実施形態によるバックライト装置を備えた液晶表示装置の構造を示した断面図である。FIG. 6 is a cross-sectional view illustrating a structure of a liquid crystal display device including a backlight device according to a second embodiment of the present invention illustrated in FIG. 5. 図５に示したバックライト装置のフレームの構造を示した平面図である。FIG. 6 is a plan view showing a structure of a frame of the backlight device shown in FIG. 5. 本発明の第３実施形態によるバックライト装置を備えた液晶表示装置の構造を示した分解斜視図である。It is the disassembled perspective view which showed the structure of the liquid crystal display device provided with the backlight apparatus by 3rd Embodiment of this invention. 図８に示した本発明の第３実施形態によるバックライト装置を備えた液晶表示装置の構造を示した断面図である。FIG. 9 is a cross-sectional view illustrating a structure of a liquid crystal display device including a backlight device according to a third embodiment of the present invention illustrated in FIG. 8. 従来の一例によるサイドライト型のバックライト装置を備えた表示装置の構造を示した断面図である。It is sectional drawing which showed the structure of the display apparatus provided with the sidelight type backlight apparatus by an example of the past.
（第１実施形態）
　図１～図４を参照して、本発明の第１実施形態によるバックライト装置１０を備えた液晶表示装置１の構造について説明する。なお、液晶表示装置１は、本発明の「表示装置」の一例である。 (First embodiment)
The structure of the liquid crystal display device 1 including the backlight device 10 according to the first embodiment of the present invention will be described with reference to FIGS. The liquid crystal display device 1 is an example of the “display device” in the present invention.
　本発明の第１実施形態によるバックライト装置１０を備えた液晶表示装置１は、携帯電話機などの電子機器に用いられる。また、液晶表示装置１は、図１に示すように、液晶表示パネル２と、液晶表示パネル２を挟み込む上偏光板３および下偏光板４（図２参照）と、液晶表示パネル２の背面側（下側）に配置されたバックライト装置１０と、バックライト装置１０の背面側を覆うメタルフレーム５とによって構成されている。なお、液晶表示パネル２は、本発明の「表示パネル」の一例である。 The liquid crystal display device 1 including the backlight device 10 according to the first embodiment of the present invention is used in an electronic device such as a mobile phone. As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal display panel 2, an upper polarizing plate 3 and a lower polarizing plate 4 (see FIG. 2) sandwiching the liquid crystal display panel 2, and the back side of the liquid crystal display panel 2. It is comprised by the backlight apparatus 10 arrange | positioned (lower side) and the metal frame 5 which covers the back side of the backlight apparatus 10. FIG. The liquid crystal display panel 2 is an example of the “display panel” in the present invention.
　液晶表示パネル２は、図２に示すように、透明なＡＭ基板（アクティブマトリックス基板）２ａと、ＡＭ基板２ａに対向配置され、ＡＭ基板２ａよりも小さい面積を有する透明な対向基板２ｂとを含んでいる。また、ＡＭ基板２ａと対向基板２ｂとの間には、図示しない液晶が封入されている。そして、液晶表示パネル２は、バックライト装置１０に照明されることにより、表示パネルとして機能する。 As shown in FIG. 2, the liquid crystal display panel 2 includes a transparent AM substrate (active matrix substrate) 2a, and a transparent counter substrate 2b disposed opposite to the AM substrate 2a and having a smaller area than the AM substrate 2a. It is out. Further, liquid crystal (not shown) is sealed between the AM substrate 2a and the counter substrate 2b. The liquid crystal display panel 2 functions as a display panel when illuminated by the backlight device 10.
　ＡＭ基板２ａの前面には、駆動用ＩＣ６およびＦＰＣ７が取り付けられている。このＦＰＣ７は、所定の位置で折り曲げられることにより、後述するフレーム１６の背面側にも配置されている。また、ＦＰＣ７の端部には、図１に示すように、外部と電気的に接続するためのコネクタ部材８が取り付けられている。 The driving IC 6 and the FPC 7 are attached to the front surface of the AM substrate 2a. The FPC 7 is also arranged on the back side of the frame 16 described later by being bent at a predetermined position. Further, as shown in FIG. 1, a connector member 8 for electrical connection with the outside is attached to the end of the FPC 7.
　また、液晶表示パネル２は、図１および図２に示すように、両面テープなどからなる後述する接着部材１９により、後述するフレーム１６の前面に接着（固定）されている。 Further, as shown in FIGS. 1 and 2, the liquid crystal display panel 2 is bonded (fixed) to the front surface of a frame 16 to be described later by an adhesive member 19 to be described later made of double-sided tape or the like.
　ここで、第１実施形態では、バックライト装置１０は、図２に示すように、サイドライト型（エッジライト型）のバックライト装置であり、複数のＬＥＤ１１と、ＬＥＤ１１からの光が入射される光入射面１２ａを有する導光板１２と、導光板１２の光出射面１２ｂに対向配置された規制部材１３および複数の光学シート１４と、導光板１２の背面側に配置された反射シート１５と、これらを収納する樹脂製のフレーム１６とを含んでいる。なお、ＬＥＤ１１は、本発明の「発光素子」の一例である。 Here, in the first embodiment, the backlight device 10 is a sidelight type (edge light type) backlight device as shown in FIG. 2, and a plurality of LEDs 11 and light from the LEDs 11 are incident thereon. A light guide plate 12 having a light incident surface 12a, a regulating member 13 and a plurality of optical sheets 14 arranged to face the light emitting surface 12b of the light guide plate 12, a reflection sheet 15 arranged on the back side of the light guide plate 12, And a resin frame 16 for housing them. The LED 11 is an example of the “light emitting element” in the present invention.
　複数のＬＥＤ１１は、半田層１７を介してＦＰＣ７に固定されている。また、複数のＬＥＤ１１は、導光板１２の光入射面１２ａに対向するようにＡ方向（図３参照）に所定のピッチで配置されている。 The plurality of LEDs 11 are fixed to the FPC 7 via the solder layer 17. The plurality of LEDs 11 are arranged at a predetermined pitch in the A direction (see FIG. 3) so as to face the light incident surface 12 a of the light guide plate 12.
　また、ＬＥＤ１１は、青色発光チップ１１ａと、青色発光チップ１１ａを収納する凹部１１ｂを有するパッケージ本体部１１ｃと、青色発光チップ１１ａを覆うようにパッケージ本体部１１ｃの凹部１１ｂに充填される充填材１１ｄとによって構成されている。この充填材１１ｄは、蛍光材などを含む透明な樹脂からなる。なお、青色発光チップ１１ａは、本発明の「発光チップ」の一例である。 The LED 11 includes a blue light emitting chip 11a, a package main body portion 11c having a concave portion 11b for housing the blue light emitting chip 11a, and a filler 11d filled in the concave portion 11b of the package main body portion 11c so as to cover the blue light emitting chip 11a. And is composed of. The filler 11d is made of a transparent resin including a fluorescent material. The blue light emitting chip 11a is an example of the “light emitting chip” in the present invention.
　ＦＰＣ７のフレーム１６の背面側に配置された部分は、両面テープなどからなる接着部材１８によりフレーム１６の背面に接着されている。 The portion arranged on the back side of the frame 16 of the FPC 7 is bonded to the back surface of the frame 16 by an adhesive member 18 made of double-sided tape or the like.
　この接着部材１８は、図１に示すように、１つのＦＰＣ接着部１８ａと、３つのメタルフレーム接着部１８ｂ、１８ｃおよび１８ｄとを含んでいる。そして、ＦＰＣ接着部１８ａは、フレーム１６とＦＰＣ７とを接着している。また、３つのメタルフレーム接着部１８ｂ、１８ｃおよび１８ｄは、フレーム１６とメタルフレーム５とを接着している。 As shown in FIG. 1, the adhesive member 18 includes one FPC adhesive portion 18a and three metal frame adhesive portions 18b, 18c and 18d. The FPC bonding portion 18a bonds the frame 16 and the FPC 7 together. Further, the three metal frame bonding portions 18b, 18c and 18d bond the frame 16 and the metal frame 5.
　導光板１２は、図２に示すように、後述する接着部材１９から所定の距離を隔てて配置されている。また、導光板１２は、光入射面１２ａと光出射面１２ｂとが互いに略直交する方向に延びるように形成されている。また、導光板１２は、ＬＥＤ１１からの光を、光入射面１２ａから入射するとともに、光出射面１２ｂから液晶表示パネル２側（Ｃ１方向）に向かって出射する機能を有する。 2, the light guide plate 12 is arranged at a predetermined distance from an adhesive member 19 described later. The light guide plate 12 is formed so that the light incident surface 12a and the light emitting surface 12b extend in a direction substantially orthogonal to each other. The light guide plate 12 has a function of emitting light from the LED 11 from the light incident surface 12a and emitting the light from the light emitting surface 12b toward the liquid crystal display panel 2 side (C1 direction).
　また、導光板１２の光入射面１２ａと光出射面１２ｂとの間には、光出射面１２ｂに対して角度θ１（例えば１２°）傾斜した傾斜面１２ｃが形成されている。すなわち、導光板１２は、光入射面１２ａ側（ＬＥＤ１１側）の部分が、光出射面１２ｂ側の部分よりも厚みが大きくなるように形成されている。具体的には、導光板１２の光入射面１２ａ側（ＬＥＤ１１側）の部分は、例えば０．６ｍｍの厚みを有し、光出射面１２ｂ側の部分は、例えば０．４２ｍｍの厚みを有する。 Further, between the light incident surface 12a and the light emitting surface 12b of the light guide plate 12, an inclined surface 12c inclined by an angle θ1 (for example, 12 °) with respect to the light emitting surface 12b is formed. That is, the light guide plate 12 is formed so that the portion on the light incident surface 12a side (the LED 11 side) is thicker than the portion on the light emitting surface 12b side. Specifically, the portion on the light incident surface 12a side (LED 11 side) of the light guide plate 12 has a thickness of 0.6 mm, for example, and the portion on the light output surface 12b side has a thickness of 0.42 mm, for example.
　また、導光板１２の光入射面１２ａは、ＬＥＤ１１のパッケージ本体部１１ｃの凹部１１ｂよりも前方（Ｃ１方向）の位置まで形成されている。 Further, the light incident surface 12a of the light guide plate 12 is formed to a position ahead (C1 direction) from the concave portion 11b of the package main body portion 11c of the LED 11.
　また、第１実施形態では、規制部材１３は、白色であり、光を反射する機能を有するとともに、遮光性も有する。また、規制部材１３は、導光板１２の光出射面１２ｂのＬＥＤ１１側（Ｂ１方向側）の部分の前方（Ｃ１方向）に配置されている。 In the first embodiment, the regulating member 13 is white, has a function of reflecting light, and also has a light shielding property. The restricting member 13 is disposed in front (C1 direction) of the LED 11 side (B1 direction side) portion of the light emitting surface 12b of the light guide plate 12.
　また、第１実施形態では、規制部材１３は、導光板１２の光入射面１２ａ、傾斜面１２ｃおよび光出射面１２ｂの前方に配置される幅広シート部材１３ａと、導光板１２の光出射面１２ｂの前方に配置される幅狭シート部材１３ｂと、幅広シート部材１３ａおよび幅狭シート部材１３ｂを接着する接着部材１３ｃとによって構成されている。これにより、規制部材１３は、Ｌ字状の断面を有する。 In the first embodiment, the regulating member 13 includes a wide sheet member 13a disposed in front of the light incident surface 12a, the inclined surface 12c, and the light emitting surface 12b of the light guide plate 12, and the light emitting surface 12b of the light guide plate 12. The narrow sheet member 13b disposed in front of the sheet and the wide sheet member 13a and the adhesive member 13c for bonding the narrow sheet member 13b. Thereby, the regulating member 13 has an L-shaped cross section.
　また、幅広シート部材１３ａおよび幅狭シート部材１３ｂは、同一の材質（例えばＰＥＴ（ポリエチレンテレフタレート）などの樹脂）からなるとともに、同一の厚みを有する。 The wide sheet member 13a and the narrow sheet member 13b are made of the same material (for example, resin such as PET (polyethylene terephthalate)) and have the same thickness.
　また、第１実施形態では、規制部材１３は、導光板１２の厚み方向（Ｃ方向）に導光板１２が移動するのを規制する機能を有する。具体的には、幅広シート部材１３ａ（規制部材１３）は、後述する接着部材１９に接着（固定）されている。また、導光板１２の光出射面１２ｂ（光学シート１４の後述する拡散シート１４ａ）と規制部材１３の幅狭シート部材１３ｂとの間の距離（例えば数十μｍ）が、導光板１２の光入射面１２ａ側の部分と規制部材１３の幅広シート部材１３ａや接着部材１９との間の距離よりも小さくなるように、規制部材１３が形成されている。これにより、導光板１２が厚み方向（Ｃ方向）に移動するのが規制される。 In the first embodiment, the regulating member 13 has a function of regulating the movement of the light guide plate 12 in the thickness direction (C direction) of the light guide plate 12. Specifically, the wide sheet member 13a (regulating member 13) is bonded (fixed) to an adhesive member 19 described later. Further, the distance (for example, several tens of μm) between the light emission surface 12b of the light guide plate 12 (a diffusion sheet 14a to be described later of the optical sheet 14) and the narrow sheet member 13b of the regulating member 13 is light incident on the light guide plate 12. The regulating member 13 is formed so as to be smaller than the distance between the portion on the surface 12 a side and the wide sheet member 13 a and the adhesive member 19 of the regulating member 13. This restricts the light guide plate 12 from moving in the thickness direction (C direction).
　複数の光学シート１４は、導光板１２に接するように配置され、光を拡散する機能を有する拡散シート１４ａや、拡散シート１４ａの前方（Ｃ１方向）に配置され、光を集光する機能を有する下レンズシート１４ｂおよび上レンズシート１４ｃによって構成されている。 The plurality of optical sheets 14 are disposed so as to be in contact with the light guide plate 12 and are disposed in front of the diffusion sheet 14a (in the C1 direction) having a function of diffusing light and have a function of condensing light. The lower lens sheet 14b and the upper lens sheet 14c are configured.
　反射シート１５は、導光板１２の背面から出射した光を反射して、導光板１２側（Ｃ１方向）に進行させる機能を有する。 The reflection sheet 15 has a function of reflecting the light emitted from the back surface of the light guide plate 12 and traveling the light guide plate 12 side (C1 direction).
　フレーム１６は、複数のＬＥＤ１１、導光板１２および複数の光学シート１４などを収納している。また、フレーム１６は、図４に示すように、開口部１６ａを有するとともに、長辺部１６ｂおよび１６ｃと、短辺部１６ｄおよび１６ｅとからなる枠状に形成されている。 The frame 16 houses a plurality of LEDs 11, a light guide plate 12, a plurality of optical sheets 14, and the like. As shown in FIG. 4, the frame 16 has an opening 16a and is formed in a frame shape including long side portions 16b and 16c and short side portions 16d and 16e.
　そして、図３に示すように、長辺部１６ｃと短辺部１６ｄおよび１６ｅとに囲まれた部分には、複数の光学シート１４が配置されている。これにより、光学シート１４が面方向（Ａ方向およびＢ方向）に移動するのを抑制することが可能である。なお、光学シート１４と同様、導光板１２も、面方向（Ａ方向おびＢ方向）に移動するのが抑制されている。 And as shown in FIG. 3, the some optical sheet 14 is arrange | positioned in the part enclosed by the long side part 16c and the short side parts 16d and 16e. Thereby, it is possible to suppress the optical sheet 14 from moving in the surface direction (A direction and B direction). In addition, like the optical sheet 14, the light guide plate 12 is also suppressed from moving in the surface direction (A direction and B direction).
　また、開口部１６ａの長辺部１６ｂ側の部分には、規制部材１３が配置されている。この開口部１６ａの長辺部１６ｂ側の部分は、規制部材１３の幅広シート部材１３ａと略同じ形状に形成されている。 Further, a regulating member 13 is disposed on the long side portion 16b side of the opening portion 16a. A portion of the opening portion 16a on the long side portion 16b side is formed in substantially the same shape as the wide sheet member 13a of the regulating member 13.
　また、第１実施形態では、フレーム１６の長辺部１６ｂは、規制部材１３の幅広シート部材１３ａが面方向（Ａ方向およびＢ１方向）に移動するのを抑制（規制）する機能を有し、光学シート１４（下レンズシート１４ｂおよび上レンズシート１４ｃ）は、規制部材１３の幅広シート部材１３ａが面方向（Ｂ２方向）に移動するのを抑制（規制）する機能を有する。 Moreover, in 1st Embodiment, the long side part 16b of the flame | frame 16 has a function which suppresses (regulates) that the wide sheet | seat member 13a of the limitation member 13 moves to a surface direction (A direction and B1 direction), The optical sheet 14 (the lower lens sheet 14b and the upper lens sheet 14c) has a function of suppressing (restricting) the movement of the wide sheet member 13a of the restricting member 13 in the surface direction (B2 direction).
　具体的には、バックライト装置１０を組み立てる場合、図２に示すように、フレーム１６の開口部１６ａに導光板１２および複数の光学シート１４を配置した状態で、規制部材１３を導光板１２の前方（Ｃ１方向）に配置する。このとき、図３に示すように、フレーム１６の長辺部１６ｂにより、規制部材１３の幅広シート部材１３ａが面方向（Ａ方向およびＢ１方向）に移動するのが抑制（規制）される。また、このとき、光学シート１４の下レンズシート１４ｂおよび上レンズシート１４ｃにより、規制部材１３の幅広シート部材１３ａが面方向（Ｂ２方向）に移動するのが抑制（規制）される。このようにして、規制部材１３が位置決めされる。そして、規制部材１３が位置決めされた状態で、接着部材１９をフレーム１６および規制部材１３に接着することにより、規制部材１３が固定される。 Specifically, when assembling the backlight device 10, as shown in FIG. 2, with the light guide plate 12 and the plurality of optical sheets 14 disposed in the opening 16 a of the frame 16, the regulating member 13 is attached to the light guide plate 12. It arrange | positions ahead (C1 direction). At this time, as shown in FIG. 3, the long side portion 16 b of the frame 16 suppresses (restricts) the wide sheet member 13 a of the restricting member 13 from moving in the surface direction (A direction and B1 direction). At this time, the lower lens sheet 14b and the upper lens sheet 14c of the optical sheet 14 suppress (restrict) the movement of the wide sheet member 13a of the restricting member 13 in the surface direction (B2 direction). In this way, the regulating member 13 is positioned. Then, the regulating member 13 is fixed by adhering the adhesive member 19 to the frame 16 and the regulating member 13 in a state where the regulating member 13 is positioned.
　また、図１に示すように、フレーム１６と液晶表示パネル２とを接着（固定）する接着部材１９は、開口部１９ａを有するとともに、長辺部１９ｂおよび１９ｃと、短辺部１９ｄおよび１９ｅとからなる枠状に形成されている。 As shown in FIG. 1, an adhesive member 19 that bonds (fixes) the frame 16 and the liquid crystal display panel 2 has an opening 19a, long sides 19b and 19c, short sides 19d and 19e, It is formed in the frame shape which consists of.
　この長辺部１９ｂは、フレーム１６の長辺部１６ｂよりも大きい幅を有する。また、長辺部１９ｂは、図２に示すように、導光板１２の光入射面１２ａ、傾斜面１２ｃおよび光出射面１２ｂの前方の位置まで配置されている。 The long side portion 19b has a larger width than the long side portion 16b of the frame 16. Moreover, the long side part 19b is arrange | positioned to the position ahead of the light-incidence surface 12a, the inclined surface 12c, and the light-projection surface 12b of the light-guide plate 12, as shown in FIG.
　第１実施形態では、上記のように、導光板１２の光出射面１２ｂの光入射面１２ａ側（ＬＥＤ１１側）の部分の前方（Ｃ１方向）に、遮光性を有する規制部材１３を配置することによって、導光板１２に入射した光の一部が傾斜面１２ｃから液晶表示パネル２側に出射した場合にも、導光板１２から出射した光が液晶表示パネル２に到達するのを抑制することができる。これにより、液晶表示パネル２のＬＥＤ１１周辺の部分の輝度が、ＬＥＤ１１周辺以外の部分の輝度に比べて高く（大きく）なるのを抑制することができる。その結果、均斉度が低下するのを抑制することができる。 In the first embodiment, as described above, the light-shielding regulating member 13 is disposed in front of the light incident surface 12a side (LED 11 side) of the light emitting surface 12b of the light guide plate 12 (in the C1 direction). Thus, even when a part of the light incident on the light guide plate 12 is emitted from the inclined surface 12 c to the liquid crystal display panel 2 side, the light emitted from the light guide plate 12 is prevented from reaching the liquid crystal display panel 2. it can. Thereby, it can suppress that the brightness | luminance of the part around LED11 of the liquid crystal display panel 2 becomes high (large) compared with the brightness | luminance of parts other than LED11 periphery. As a result, it is possible to suppress a decrease in uniformity.
　また、第１実施形態では、上記のように、導光板１２の光出射面１２ｂの光入射面１２ａ側（ＬＥＤ１１側）の部分の前方に、導光板１２の厚み方向（Ｃ方向）に導光板１２が移動するの規制する規制部材１３を配置することによって、導光板１２が厚み方向に移動するのを抑制することができる。これにより、導光板１２全体が液晶表示パネル２に対して傾斜するのを抑制することができるので、液晶表示パネル２のＬＥＤ１１側の部分の輝度が高く（ＬＥＤ１１とは反対側の部分の輝度が低く）なったり、液晶表示パネル２のＬＥＤ１１側の部分の輝度が低く（ＬＥＤ１１とは反対側の部分の輝度が高く）なったりするのを抑制することができる。その結果、均斉度が低下するのを、より抑制することができる。 In the first embodiment, as described above, the light guide plate is arranged in the thickness direction (C direction) of the light guide plate 12 in front of the light incident surface 12a side (LED 11 side) portion of the light output surface 12b of the light guide plate 12. By disposing the restricting member 13 that restricts the movement of the light guide plate 12, it is possible to suppress the light guide plate 12 from moving in the thickness direction. Thereby, since it can suppress that the whole light-guide plate 12 inclines with respect to the liquid crystal display panel 2, the brightness | luminance of the part by the side of LED11 of the liquid crystal display panel 2 is high (the brightness | luminance of the part on the opposite side to LED11 is high). And the brightness of the portion of the liquid crystal display panel 2 on the LED 11 side is low (the brightness of the portion on the opposite side of the LED 11 is high). As a result, it is possible to further suppress the decrease in the uniformity.
　また、第１実施形態では、上記のように、導光板１２を、光入射面１２ａ側の部分が光出射面１２ｂ側の部分よりも厚みが大きくなるように形成することによって、光入射面１２ａの面積をより大きくすることができる。これにより、ＬＥＤ１１から出射した光を、より多く、導光板１２に入射させることができるので、液晶表示パネル２の輝度を向上させることができる。 In the first embodiment, as described above, the light guide plate 12 is formed such that the portion on the light incident surface 12a side is thicker than the portion on the light exit surface 12b side, thereby making the light incident surface 12a. The area of can be made larger. Thereby, more light emitted from the LED 11 can be incident on the light guide plate 12, so that the luminance of the liquid crystal display panel 2 can be improved.
　また、第１実施形態では、上記のように、導光板１２を、光入射面１２ａ側の部分が光出射面１２ｂ側の部分よりも厚みが大きくなるように形成することによって、導光板１２の光出射面１２ｂ側の部分の厚みを小さくすることができるので、バックライト装置１０（液晶表示装置１）全体の厚みを小さくすることができる。 In the first embodiment, as described above, the light guide plate 12 is formed such that the portion on the light incident surface 12a side is thicker than the portion on the light exit surface 12b side. Since the thickness of the portion on the light emitting surface 12b side can be reduced, the thickness of the entire backlight device 10 (liquid crystal display device 1) can be reduced.
　また、第１実施形態では、上記のように、規制部材１３を、接着部材１９に固定（接着）することによって、規制部材１３がフレーム１６や導光板１２などに対して移動するのを、容易に抑制することができる。 Further, in the first embodiment, as described above, by fixing (adhering) the regulating member 13 to the adhesive member 19, it is easy for the regulating member 13 to move with respect to the frame 16, the light guide plate 12, and the like. Can be suppressed.
　また、第１実施形態では、上記のように、規制部材１３を、幅広シート部材１３ａと幅狭シート部材１３ｂとを接着することにより形成することによって、幅広シート部材１３ａと幅狭シート部材１３ｂとを接着するだけで、規制部材１３を、Ｌ字状の断面を有するように形成することができる。これにより、規制部材１３を、例えば金型を用いた樹脂成形により、Ｌ字状の断面を有するように形成する場合に比べて、規制部材１３を、容易に、Ｌ字状の断面を有するように形成することができる。また、規制部材１３の幅広シート部材１３ａを、導光板１２の光入射面１２ａおよび光出射面１２ｂの前方に配置することによって、導光板１２が、接着部材１９に接着するのを抑制することができる。これにより、導光板１２に入射した光が接着部材１９側に出射し接着部材１９に吸収されるのを抑制することができるので、光の利用効率が低下し液晶表示パネル２の輝度が低下するのを抑制することができる。なお、導光板１２が接着部材１９に接着している場合、導光板１２に入射した光は、導光板１２の接着部材１９に接着している部分から出射しやすくなる。そして、導光板１２から出射した光は、接着部材１９に吸収される。このため、光の利用効率が低下し、液晶表示パネル２の輝度が低下する。 In the first embodiment, as described above, the regulating member 13 is formed by adhering the wide sheet member 13a and the narrow sheet member 13b, thereby forming the wide sheet member 13a and the narrow sheet member 13b. By simply bonding, the regulating member 13 can be formed to have an L-shaped cross section. As a result, the restriction member 13 has an L-shaped cross section more easily than a case where the restriction member 13 is formed to have an L-shaped cross section by, for example, resin molding using a mold. Can be formed. Further, by arranging the wide sheet member 13 a of the restricting member 13 in front of the light incident surface 12 a and the light emitting surface 12 b of the light guide plate 12, it is possible to suppress the light guide plate 12 from adhering to the adhesive member 19. it can. Thereby, since it can suppress that the light which injected into the light-guide plate 12 is radiate | emitted to the adhesive member 19 side, and is absorbed by the adhesive member 19, the utilization efficiency of light falls and the brightness | luminance of the liquid crystal display panel 2 falls. Can be suppressed. When the light guide plate 12 is bonded to the adhesive member 19, the light incident on the light guide plate 12 is easily emitted from the portion of the light guide plate 12 that is bonded to the adhesive member 19. Then, the light emitted from the light guide plate 12 is absorbed by the adhesive member 19. For this reason, the utilization efficiency of light falls and the brightness | luminance of the liquid crystal display panel 2 falls.
　また、第１実施形態では、上記のように、フレーム１６の長辺部１６ｂを、規制部材１３の幅広シート部材１３ａが面方向（Ａ方向およびＢ１方向）に移動するのを抑制（規制）する機能を有するように構成することによって、組立時に、規制部材１３が面方向に移動するのを、容易に抑制することができる。これにより、バックライト装置１０を組み立てやすくすることができる。 In the first embodiment, as described above, the long side portion 16b of the frame 16 is restrained (restricted) from moving the wide sheet member 13a of the restricting member 13 in the surface direction (A direction and B1 direction). By comprising so that it may have a function, it can suppress easily that the control member 13 moves to a surface direction at the time of an assembly. Thereby, the backlight apparatus 10 can be made easy to assemble.
　また、第１実施形態では、上記のように、規制部材１３を、白色に形成することによって、規制部材１３が、例えば黒色である場合に比べて、規制部材１３の光の反射率を大きくすることができる。これにより、導光板１２の傾斜面１２ｃから出射した光を、規制部材１３を用いて、より多く反射させることができるので、導光板１２の傾斜面１２ｃから出射した光を、より多く、導光板１２に再度入射させることができる。これにより、光の利用効率を向上させることができるので、液晶表示パネル２の輝度を高くすることができる。 Further, in the first embodiment, as described above, by forming the regulation member 13 in white, the light reflectance of the regulation member 13 is increased compared to the case where the regulation member 13 is black, for example. be able to. Thereby, since more light emitted from the inclined surface 12c of the light guide plate 12 can be reflected by using the regulating member 13, more light emitted from the inclined surface 12c of the light guide plate 12 can be reflected. 12 can be incident again. Thereby, since the utilization efficiency of light can be improved, the brightness | luminance of the liquid crystal display panel 2 can be made high.
　また、第１実施形態では、上記のように、導光板１２の光入射面１２ａを、パッケージ本体部１１ｃの凹部１１ｂよりも前方の位置まで形成することによって、ＬＥＤ１１から出射した光を、より多く、導光板１２の光入射面１２ａに入射させることができる。これにより、液晶表示パネル２の輝度をより向上させることができる。 In the first embodiment, as described above, the light incident surface 12a of the light guide plate 12 is formed to a position ahead of the recess 11b of the package body 11c, so that more light is emitted from the LED 11. The light can be incident on the light incident surface 12 a of the light guide plate 12. Thereby, the brightness | luminance of the liquid crystal display panel 2 can be improved more.
　また、第１実施形態では、上記のように、幅広シート部材１３ａおよび幅狭シート部材１３ｂは、同一の材質からなるとともに、同一の厚みを有する。これにより、幅広シート部材１３ａおよび幅狭シート部材１３ｂを、同一の材料（シート部材）を用いて形成することができるので、製造コストを低減することができる。 In the first embodiment, as described above, the wide sheet member 13a and the narrow sheet member 13b are made of the same material and have the same thickness. Thereby, since the wide sheet member 13a and the narrow sheet member 13b can be formed using the same material (sheet member), manufacturing cost can be reduced.
　次に、上記した本発明の第１実施形態によるバックライト装置１０を備えた液晶表示装置１の効果を確認するために行った比較実験について説明する。この比較実験では、上記第１実施形態に対応する実施例による液晶表示装置と、上記実施例とは異なり規制部材が設けられていない比較例による液晶表示装置とを用いた。そして、実施例および比較例による液晶表示装置について、比較実験を行った。 Next, a comparative experiment performed to confirm the effect of the liquid crystal display device 1 including the backlight device 10 according to the first embodiment of the present invention described above will be described. In this comparative experiment, a liquid crystal display device according to an example corresponding to the first embodiment and a liquid crystal display device according to a comparative example in which a regulating member is not provided unlike the above example were used. And the comparative experiment was done about the liquid crystal display device by an Example and a comparative example.
　まず、実施例および比較例による液晶表示装置の均斉度を比較した実験について説明する。この比較実験では、実施例および比較例による液晶表示装置を、３０台ずつ準備した。なお、比較例による液晶表示装置の構造は、規制部材が設けられていないこと以外は、実施例による液晶表示装置の構造と同じにした。 First, an experiment comparing the uniformity of liquid crystal display devices according to examples and comparative examples will be described. In this comparative experiment, 30 liquid crystal display devices according to Examples and Comparative Examples were prepared. The structure of the liquid crystal display device according to the comparative example was the same as the structure of the liquid crystal display device according to the example except that no regulating member was provided.
　そして、各液晶表示装置について、液晶表示パネル２（上偏光板３）上の９点（図１の点Ｐ１～Ｐ９）の輝度を測定し、９点（点Ｐ１～Ｐ９）の輝度の最大値を最小値で除することにより、均斉度を算出した。この算出した各３０個の均斉度の平均値、最大値および最小値を、以下の表１に示す。 For each liquid crystal display device, the luminance of 9 points (points P1 to P9 in FIG. 1) on the liquid crystal display panel 2 (upper polarizing plate 3) is measured, and the maximum value of the luminance of 9 points (points P1 to P9) is measured. The uniformity was calculated by dividing by the minimum value. The average value, the maximum value, and the minimum value of the calculated 30 uniformity values are shown in Table 1 below.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　上記表１に示すように、実施例による液晶表示装置は、比較例による液晶表示装置に比べて、均斉度が向上する（１に近づく）ことが判明した。具体的には、実施例による液晶表示装置の均斉度の平均値、最大値、最小値および標準偏差は、それぞれ、約１．１３、約１．１９、約１．１０および約０．０３であった。その一方、比較例による液晶表示装置の均斉度の平均値、最大値、最小値および標準偏差は、それぞれ、約１．２１、約１．３７、約１．１２および約０．０６であった。 As shown in Table 1 above, it was found that the liquid crystal display device according to the example has improved uniformity (closer to 1) than the liquid crystal display device according to the comparative example. Specifically, the average value, the maximum value, the minimum value, and the standard deviation of the uniformity of the liquid crystal display device according to the example are about 1.13, about 1.19, about 1.10, and about 0.03, respectively. there were. On the other hand, the average value, maximum value, minimum value and standard deviation of the uniformity of the liquid crystal display device according to the comparative example were about 1.21, about 1.37, about 1.12 and about 0.06, respectively. .
　これは、以下の理由によるものと考えられる。すなわち、実施例による液晶表示装置では、導光板１２の光出射面１２ｂの光入射面１２ａ側（ＬＥＤ１１側）の部分の前方に遮光性を有する規制部材１３を配置することによって、導光板１２に入射した光の一部が傾斜面１２ｃから液晶表示パネル２側に出射した場合にも、導光板１２から出射した光が液晶表示パネル２に到達するのを抑制することができた。これにより、液晶表示パネル２のＬＥＤ１１周辺の部分の輝度が、ＬＥＤ１１周辺以外の部分の輝度に比べて高く（大きく）なるのを抑制することができた。その結果、均斉度が向上したと考えられる。 This is thought to be due to the following reasons. In other words, in the liquid crystal display device according to the embodiment, the light blocking plate 13 is disposed in front of the light incident surface 12a side (LED 11 side) portion of the light emitting surface 12b of the light guide plate 12, thereby providing the light guide plate 12 with the light shielding property. Even when a part of the incident light was emitted from the inclined surface 12 c to the liquid crystal display panel 2 side, it was possible to suppress the light emitted from the light guide plate 12 from reaching the liquid crystal display panel 2. Thereby, it was possible to suppress the luminance of the portion around the LED 11 of the liquid crystal display panel 2 from becoming higher (larger) than the luminance of the portion other than the portion around the LED 11. As a result, it is considered that the uniformity is improved.
　また、実施例による液晶表示装置では、導光板１２の光出射面１２ｂの光入射面１２ａ側（ＬＥＤ１１側）の部分の前方に、厚み方向（Ｃ方向）に導光板１２が移動するの規制する規制部材１３を配置することによって、導光板１２が厚み方向に移動するのを抑制することができた。これにより、導光板１２全体が液晶表示パネル２に対して傾斜するのを抑制することができたので、液晶表示パネル２のＬＥＤ１１側の部分の輝度が高く（ＬＥＤ１１とは反対側の部分の輝度が低く）なったり、液晶表示パネル２のＬＥＤ１１側の部分の輝度が低く（ＬＥＤ１１とは反対側の部分の輝度が高く）なったりするのを抑制することができた。その結果、均斉度がより向上したと考えられる。 In the liquid crystal display device according to the embodiment, the light guide plate 12 is restricted from moving in the thickness direction (C direction) in front of the light incident surface 12a side (LED 11 side) portion of the light output surface 12b of the light guide plate 12. By arranging the regulating member 13, the light guide plate 12 can be prevented from moving in the thickness direction. Thereby, since it was possible to suppress the entire light guide plate 12 from being inclined with respect to the liquid crystal display panel 2, the luminance of the portion on the LED 11 side of the liquid crystal display panel 2 is high (the luminance of the portion on the opposite side of the LED 11). And the brightness of the portion of the liquid crystal display panel 2 on the LED 11 side is low (the brightness of the portion on the opposite side of the LED 11 is high). As a result, it is considered that the uniformity is further improved.
　また、実施例による液晶表示装置では、導光板１２が厚み方向に移動するのを抑制することができたので、導光板１２に入射する光の量がばらつくのを抑制することができた。これにより、均斉度の標準偏差が小さく（ばらつきが小さく）なったと考えられる。 Further, in the liquid crystal display device according to the example, since the light guide plate 12 can be suppressed from moving in the thickness direction, the amount of light incident on the light guide plate 12 can be suppressed from varying. Thereby, it is considered that the standard deviation of the uniformity is small (variation is small).
　次に、実施例および比較例による液晶表示装置の輝度を比較した実験について説明する。この比較実験では、実施例および比較例による液晶表示装置について、液晶表示パネル２（上偏光板３）の中心（図１の点Ｐ５）上の輝度を比較した。具体的には、上記の均斉度の比較実験の際に測定した各３０個の点Ｐ５の輝度を用いて、輝度の平均値を算出した。 Next, an experiment comparing the luminance of the liquid crystal display devices according to the example and the comparative example will be described. In this comparative experiment, the luminance on the center (point P5 in FIG. 1) of the liquid crystal display panel 2 (upper polarizing plate 3) was compared for the liquid crystal display devices according to the example and the comparative example. Specifically, the average value of the luminance was calculated using the luminance of each of the 30 points P5 measured in the comparison experiment of the above-mentioned uniformity.
　この比較実験では、実施例による液晶表示装置は、比較例による液晶表示装置に比べて、輝度が向上することが判明した。具体的には、実施例による液晶表示装置の輝度の平均値は、約２９６（ｃｄ／ｍ２）であった。その一方、比較例による液晶表示装置の輝度の平均値は、約２９２（ｃｄ／ｍ２）であった。 In this comparative experiment, it was found that the brightness of the liquid crystal display device according to the example was improved as compared with the liquid crystal display device according to the comparative example. Specifically, the average value of the luminance of the liquid crystal display device according to the example was about 296 (cd / m 2 ). On the other hand, the average value of the luminance of the liquid crystal display device according to the comparative example was about 292 (cd / m 2 ).
　これは、以下の理由によるものと考えられる。すなわち、実施例による液晶表示装置では、規制部材１３を、光を反射する機能を有するように形成することによって、導光板１２の傾斜面１２ｃから出射した光を、規制部材１３を用いて反射させることができるので、導光板１２の傾斜面１２ｃから出射した光を、導光板１２に再度入射させることができた。これにより、光の利用効率を向上させることができたので、液晶表示パネル２の輝度を高くすることができたと考えられる。 This is thought to be due to the following reasons. That is, in the liquid crystal display device according to the embodiment, the light emitted from the inclined surface 12c of the light guide plate 12 is reflected by using the restricting member 13 by forming the restricting member 13 to have a function of reflecting light. Therefore, the light emitted from the inclined surface 12c of the light guide plate 12 can be incident again on the light guide plate 12. As a result, the light utilization efficiency can be improved, and it is considered that the luminance of the liquid crystal display panel 2 can be increased.
（第２実施形態）
　この第２実施形態では、図５～図７を参照して、上記第１実施形態とは異なり、規制部（規制部材）１１６ｇがフレーム１１６に一体的に形成されている場合について説明する。 (Second Embodiment)
In the second embodiment, with reference to FIGS. 5 to 7, unlike the first embodiment, a description will be given of a case where a regulating portion (regulating member) 116g is formed integrally with the frame 116. FIG.
　本発明の第２実施形態による液晶表示装置１０１のバックライト装置１１０では、図５および図７に示すように、樹脂製のフレーム１１６は、２つの開口部１１６ａおよび１１６ｂを有する。また、フレーム１１６は、長辺部１１６ｃおよび１１６ｄと、短辺部１１６ｅおよび１１６ｆとからなる枠状に形成されている。 In the backlight device 110 of the liquid crystal display device 101 according to the second embodiment of the present invention, as shown in FIGS. 5 and 7, the resin frame 116 has two openings 116a and 116b. The frame 116 is formed in a frame shape including long side portions 116c and 116d and short side portions 116e and 116f.
　また、第２実施形態では、図７に示すように、フレーム１１６の長辺部１１６ｃには、規制部１１６ｇが一体的に形成されており、規制部１１６ｇによって、開口部１１６ａと開口部１１６ｂとが仕切られている。なお、規制部１１６ｇは、本発明の「規制部材」の一例である。 In the second embodiment, as shown in FIG. 7, a restriction part 116 g is integrally formed on the long side part 116 c of the frame 116, and the opening part 116 a and the opening part 116 b are formed by the restriction part 116 g. Is partitioned. The regulating portion 116g is an example of the “regulating member” in the present invention.
　また、図６に示すように、規制部１１６ｇは、上記第１実施形態と同様、導光板１２の光出射面１２ｂに対向配置されている。また、規制部１１６ｇ（フレーム１１６）は、白色であり、光を反射する機能を有するとともに、遮光性も有する。 Further, as shown in FIG. 6, the restricting portion 116g is disposed opposite to the light emitting surface 12b of the light guide plate 12 as in the first embodiment. The regulating portion 116g (frame 116) is white, has a function of reflecting light, and also has a light shielding property.
　また、規制部１１６ｇは、上記第１実施形態と同様、導光板１２の厚み方向（Ｃ方向）に導光板１２が移動するのを規制する機能を有する。具体的には、規制部１１６ｇは、導光板１２の光出射面１２ｂ（拡散シート１４ａ）と規制部１１６ｇとの間の距離（例えば数十μｍ）が、導光板１２の光入射面１２ａ側の部分と接着部材１９との間の距離よりも小さくなるように形成されている。これにより、導光板１２が厚み方向（Ｃ方向）に移動するのが規制される。 Moreover, the regulation part 116g has a function which regulates that the light-guide plate 12 moves to the thickness direction (C direction) of the light-guide plate 12 similarly to the said 1st Embodiment. Specifically, the regulating portion 116g has a distance (for example, several tens of μm) between the light emitting surface 12b (diffusion sheet 14a) of the light guide plate 12 and the regulating portion 116g on the light incident surface 12a side of the light guide plate 12. It is formed to be smaller than the distance between the portion and the adhesive member 19. This restricts the light guide plate 12 from moving in the thickness direction (C direction).
　また、規制部１１６ｇは、長方形状の断面を有するように形成されている。このため、第２実施形態では、規制部１１６ｇは、導光板１２の光入射面１２ｂ側の部分の前方（Ｃ１方向）には配置されていない。なお、規制部１１６ｇをＬ字状の断面を有するように形成し、規制部１１６ｇの一部を導光板１２の光入射面１２ｂ側の部分の前方に配置してもよい。この場合、フレーム１１６に開口部１１６ａを形成しなくてもよい。 Further, the regulating portion 116g is formed to have a rectangular cross section. For this reason, in 2nd Embodiment, the control part 116g is not arrange | positioned in the front (C1 direction) of the part by the side of the light-incidence surface 12b of the light-guide plate 12. FIG. The restricting portion 116g may be formed to have an L-shaped cross section, and a portion of the restricting portion 116g may be disposed in front of the light incident surface 12b side portion of the light guide plate 12. In this case, the opening 116 a may not be formed in the frame 116.
　なお、第２実施形態のその他の構造は、上記第１実施形態と同様である。 The remaining structure of the second embodiment is the same as that of the first embodiment.
　第２実施形態では、上記のように、規制部１１６ｇを、フレーム１１６に一体的に形成することによって、規制部１１６ｇをフレーム１１６とは別体で形成する場合に比べて、規制部１１６ｇが導光板１２などに対して移動するのを、容易に抑制することができる。また、部品点数を削減することができるとともに、組立工程を簡略化することができる。 In the second embodiment, as described above, the regulating portion 116g is formed integrally with the frame 116, so that the regulating portion 116g is guided as compared with the case where the regulating portion 116g is formed separately from the frame 116. The movement with respect to the optical plate 12 or the like can be easily suppressed. In addition, the number of parts can be reduced, and the assembly process can be simplified.
　なお、第２実施形態のその他の効果は、上記第１実施形態と同様である。 The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.
（第３実施形態）
　この第３実施形態では、図８および図９を参照して、上記第１および第２実施形態とは異なり、規制部材２１３が拡散シート１４ａ（光学シート１４）に固定されている場合について説明する。 (Third embodiment)
In the third embodiment, the case where the regulating member 213 is fixed to the diffusion sheet 14a (optical sheet 14) will be described with reference to FIGS. 8 and 9, unlike the first and second embodiments. .
　本発明の第３実施形態による液晶表示装置２０１のバックライト装置２１０では、図８および図９に示すように、規制部材２１３は、拡散シート１４ａのＬＥＤ１１側（Ｂ１方向）の端部に固定（接着）されている。 In the backlight device 210 of the liquid crystal display device 201 according to the third embodiment of the present invention, as shown in FIGS. 8 and 9, the regulating member 213 is fixed to the end of the diffusion sheet 14a on the LED 11 side (B1 direction) ( Have been glued).
　具体的には、規制部材２１３は、例えば白色のＰＥＴなどの樹脂からなるシート部材２１３ａと、接着部材２１３ｂとによって構成されているとともに、長方形状の断面を有するように形成されている。この接着部材２１３ｂは、両面テープなどからなり、シート部材２１３ａを拡散シート１４ａに固定する機能を有する。 Specifically, the regulating member 213 is configured by a sheet member 213a made of a resin such as white PET and an adhesive member 213b, and has a rectangular cross section. The adhesive member 213b is made of a double-sided tape or the like and has a function of fixing the sheet member 213a to the diffusion sheet 14a.
　第３実施形態では、バックライト装置２１０を組み立てる場合、規制部材２１３が所定の位置に固定された拡散シート１４ａを準備しておく。そして、フレーム１６の開口部１６ａに導光板１２を配置した状態で、複数の光学シート１４（拡散シート１４ａ）を導光板１２の光出射面１２ｂの前方（Ｃ１方向）に配置する。このとき、規制部材２１３は拡散シート１４ａに固定されているので、規制部材２１３が面方向（Ａ方向およびＢ方向）に移動するのが抑制（規制）される。 In the third embodiment, when the backlight device 210 is assembled, the diffusion sheet 14a in which the regulating member 213 is fixed at a predetermined position is prepared. Then, in a state where the light guide plate 12 is disposed in the opening 16 a of the frame 16, the plurality of optical sheets 14 (diffusion sheets 14 a) are disposed in front of the light emitting surface 12 b of the light guide plate 12 (C1 direction). At this time, since the restriction member 213 is fixed to the diffusion sheet 14a, the movement of the restriction member 213 in the surface direction (A direction and B direction) is suppressed (restricted).
　また、第３実施形態では、規制部材２１３は、長方形状の断面を有するように形成されているので、導光板１２の光入射面１２ｂ側の部分の前方には配置されていない。なお、上記第１実施形態と同様、規制部材２１３をＬ字状の断面を有するように形成し、規制部材２１３の一部を導光板１２の光入射面１２ｂ側の部分の前方に配置してもよい。 Further, in the third embodiment, since the regulating member 213 is formed to have a rectangular cross section, it is not arranged in front of the light incident surface 12 b side portion of the light guide plate 12. As in the first embodiment, the regulating member 213 is formed to have an L-shaped cross section, and a part of the regulating member 213 is disposed in front of the light incident surface 12b side portion of the light guide plate 12. Also good.
　また、規制部材２１３は、上記第１実施形態と同様、導光板１２の厚み方向（Ｃ方向）に導光板１２が移動するのを規制する機能を有する。具体的には、規制部材２１３は、規制部材２１３と接着部材１９との間の距離（例えば数十μｍ）が、導光板１２の光入射面１２ａ側の部分と接着部材１９との間の距離よりも小さくなるように形成されている。これにより、導光板１２が厚み方向（Ｃ方向）に移動するのが規制される。 Further, the regulating member 213 has a function of regulating the movement of the light guide plate 12 in the thickness direction (C direction) of the light guide plate 12 as in the first embodiment. Specifically, in the regulating member 213, the distance between the regulating member 213 and the adhesive member 19 (for example, several tens of μm) is the distance between the portion on the light incident surface 12a side of the light guide plate 12 and the adhesive member 19. It is formed to be smaller than that. This restricts the light guide plate 12 from moving in the thickness direction (C direction).
　なお、第３実施形態のその他の構造は、上記第１実施形態と同様である。 The remaining structure of the third embodiment is the same as that of the first embodiment.
　第３実施形態では、上記のように、規制部材２１３を、拡散シート１４ａに固定することによって、規制部材２１３が拡散シート１４ａに対して移動するのを抑制することができるとともに、規制部材２１３の導光板１２に対する位置精度を向上させることができる。 In the third embodiment, as described above, by fixing the regulating member 213 to the diffusion sheet 14a, the regulation member 213 can be prevented from moving with respect to the diffusion sheet 14a, and the regulation member 213 can be prevented from moving. The positional accuracy with respect to the light guide plate 12 can be improved.
　また、第３実施形態では、上記のように、バックライト装置２１０を組み立てる場合、規制部材２１３が所定の位置に固定された拡散シート１４ａを準備しておき、拡散シート１４ａを導光板１２の光出射面１２ｂの前方（Ｃ１方向）に配置する。これにより、拡散シート１４ａを所定の位置に配置するだけで規制部材２１３も所定の位置に配置することができるので、組立工程を簡略化することができる。 In the third embodiment, as described above, when the backlight device 210 is assembled, the diffusion sheet 14a in which the restriction member 213 is fixed at a predetermined position is prepared, and the diffusion sheet 14a is used as the light of the light guide plate 12. It arrange | positions ahead of the output surface 12b (C1 direction). As a result, the restricting member 213 can also be disposed at a predetermined position simply by disposing the diffusion sheet 14a at a predetermined position, so that the assembly process can be simplified.
　なお、第３実施形態のその他の効果は、上記第１実施形態と同様である。 The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.
　なお、今回開示された実施形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく請求の範囲によって示され、さらに請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。 In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims, and further includes meanings equivalent to the scope of claims and all modifications within the scope.
　たとえば、上記実施形態では、表示装置を液晶表示装置に適用した例について示したが、本発明はこれに限らず、液晶表示装置以外の表示装置に適用してもよい。 For example, in the above-described embodiment, an example in which the display device is applied to a liquid crystal display device has been described. However, the present invention is not limited thereto, and may be applied to a display device other than the liquid crystal display device.
　また、上記実施形態では、液晶表示装置を携帯電話機などの電子機器に用いる場合について示したが、本発明はこれに限らず、液晶表示装置を携帯電話機以外の電子機器に用いてもよい。 In the above embodiment, the liquid crystal display device is used for an electronic device such as a mobile phone. However, the present invention is not limited to this, and the liquid crystal display device may be used for an electronic device other than the mobile phone.
　また、上記実施形態では、発光素子として、青色発光チップを含むＬＥＤを用いた例について示したが、本発明はこれに限らず、青色発光チップ以外の発光チップを含むＬＥＤを用いてもよいし、ＬＥＤ以外の発光素子を用いてもよい。 In the above embodiment, an example in which an LED including a blue light emitting chip is used as the light emitting element has been described. However, the present invention is not limited thereto, and an LED including a light emitting chip other than the blue light emitting chip may be used. A light emitting element other than an LED may be used.
　また、上記実施形態では、樹脂製の規制部材を用いた例について示したが、本発明はこれに限らず、樹脂以外の材質からなる規制部材を用いてもよい。 In the above-described embodiment, an example in which a resin-made regulating member is used has been described. However, the present invention is not limited to this, and a regulating member made of a material other than resin may be used.
　また、上記実施形態では、規制部材を、白色に形成した例について示したが、本発明はこれに限らず、規制部材を、比較的反射率の大きい、例えば銀色などに形成してもよいし、比較的反射率の小さい、例えば黒色に形成してもよい。また、規制部材を、光を反射する機能を有しないように形成してもよい。 In the above embodiment, the example in which the regulating member is formed in white has been described. However, the present invention is not limited to this, and the regulating member may be formed in a relatively high reflectance such as silver. Alternatively, it may be formed in a relatively low reflectance, for example, black. Further, the regulating member may be formed so as not to have a function of reflecting light.
　また、上記実施形態では、規制部材を、Ｌ字状や長方形状の断面を有するように形成した例について示したが、本発明はこれに限らず、規制部材を、Ｌ字状や長方形状以外の、例えば台形状などの断面を有するように形成してもよい。 Moreover, in the said embodiment, although the example which formed the regulating member so that it had an L-shaped or rectangular cross section was shown, this invention is not restricted to this, A regulating member is other than L-shaped or rectangular shape. For example, it may be formed to have a trapezoidal cross section.
　また、上記第１実施形態では、幅広シート部材と幅狭シート部材とを接着することにより、規制部材を形成した例について示したが、本発明はこれに限らず、金型を用いた樹脂成形により、規制部材を形成してもよい。 Moreover, in the said 1st Embodiment, although shown about the example which formed the control member by adhere | attaching a wide sheet | seat member and a narrow sheet | seat member, this invention is not limited to this, The resin molding using a metal mold | die Thus, a regulating member may be formed.
　また、上記第１実施形態では、同一の厚みを有する幅広シート部材と幅狭シート部材とを接着することにより、規制部材を形成した例について示したが、本発明はこれに限らず、異なる厚みを有する幅広シート部材と幅狭シート部材とを接着することにより、規制部材を形成してもよい。 Moreover, in the said 1st Embodiment, although shown about the example which formed the regulating member by adhere | attaching the wide sheet | seat member and narrow sheet | seat member which have the same thickness, this invention is not limited to this, Different thickness The regulating member may be formed by bonding a wide sheet member having a width and a narrow sheet member.
　また、上記第１および第２実施形態では、規制部材（規制部）と導光板との間に、拡散シートを配置した例について示したが、本発明はこれに限らず、拡散シートを短くするとともに、規制部材（規制部）と導光板との間に拡散シートを配置しないように構成してもよい。 Moreover, in the said 1st and 2nd embodiment, although the example which has arrange | positioned the diffusion sheet between the regulating member (regulation part) and the light-guide plate was shown, this invention is not restricted to this and makes a diffusion sheet short. In addition, a diffusion sheet may not be arranged between the regulating member (regulating portion) and the light guide plate.
　また、上記第１および第２実施形態では、規制部材（規制部）を、導光板や拡散シートから所定の距離を隔てて配置するとともに、上記第３実施形態では、規制部材を、接着部材１９から所定の距離を隔てて配置した例について示したが、本発明はこれに限らず、規制部材（規制部）を、導光板、拡散シートおよび接着部材１９に接するように配置してもよい。 In the first and second embodiments, the regulating member (regulating portion) is disposed at a predetermined distance from the light guide plate and the diffusion sheet. In the third embodiment, the regulating member is the adhesive member 19. However, the present invention is not limited to this, and the regulating member (regulating portion) may be arranged so as to be in contact with the light guide plate, the diffusion sheet, and the adhesive member 19.
　また、上記第３実施形態では、規制部材を拡散シートに固定した例について示したが、本発明はこれに限らず、規制部材を上レンズシートや下レンズシートなどに固定してもよい。 In the third embodiment, the example in which the restriction member is fixed to the diffusion sheet has been described. However, the present invention is not limited to this, and the restriction member may be fixed to the upper lens sheet, the lower lens sheet, or the like.
　また、上記実施形態では、導光板の傾斜面を、光出射面に対して１２°傾斜するように形成した例について示したが、本発明はこれに限らず、導光板の傾斜面を、光出射面に対して１２°よりも大きく、または、小さく傾斜するように形成してもよい。 In the above embodiment, the example in which the inclined surface of the light guide plate is formed so as to be inclined by 12 ° with respect to the light emitting surface is shown. However, the present invention is not limited to this, and the inclined surface of the light guide plate You may form so that it may incline more than 12 degrees or may be small with respect to an output surface.
　１、１０１、２０１　液晶表示装置（表示装置）
　２　液晶表示パネル（表示パネル）
　１０、１１０、２１０　バックライト装置
　１１　ＬＥＤ（発光素子）
　１１ａ　青色発光チップ（発光チップ）
　１１ｂ　凹部
　１１ｃ　パッケージ本体部
　１１ｄ　充填材
　１２　導光板
　１２ａ　光入射面
　１２ｂ　光出射面
　１２ｃ　傾斜面
　１３、２１３　規制部材
　１３ａ　幅広シート部材
　１３ｂ　幅狭シート部材
　１４　光学シート
　１４ａ　拡散シート
　１６、１１６　フレーム
　１９　接着部材
　１１６ｇ　規制部（規制部材） 1, 101, 201 Liquid crystal display device (display device)
2 Liquid crystal display panel (display panel)
10, 110, 210 Backlight device 11 LED (light emitting element)
11a Blue light emitting chip (light emitting chip)
11b Recess 11c Package body 11d Filler 12 Light guide plate 12a Light incident surface 12b Light exit surface 12c Inclined surface 13, 213 Restriction member 13a Wide sheet member 13b Narrow sheet member 14 Optical sheet 14a Diffusion sheet 16, 116 Frame 19 Adhesive member 116g Restriction part (regulation member)

Claims (11)

  1. 　サイドライト型のバックライト装置であって、
    　発光素子と、
    　前記発光素子からの光が入射される光入射面、および、入射した光を表示パネル側に出射する光出射面を含む導光板と、
    　前記導光板の光出射面に対向配置される光学シートとを備え、
    　前記導光板の前記光入射面と前記光出射面との間には、前記光出射面に対して傾斜する傾斜面が形成されており、
    　前記導光板は、前記光入射面側の部分が前記光出射面側の部分よりも厚みが大きくなるように形成されており、
    　前記導光板の光出射面の前記光入射面側の部分の前方には、遮光性を有するとともに、前記導光板の厚み方向に前記導光板が移動するの規制する規制部材が配置されていることを特徴とするバックライト装置。     A sidelight type backlight device,
    A light emitting element;
    A light incident surface on which light from the light emitting element is incident, and a light guide plate including a light emitting surface for emitting incident light to the display panel side;
    An optical sheet disposed opposite to the light exit surface of the light guide plate,
    Between the light incident surface and the light emitting surface of the light guide plate, an inclined surface that is inclined with respect to the light emitting surface is formed,
    The light guide plate is formed such that a portion on the light incident surface side is thicker than a portion on the light output surface side,
    In front of the light incident surface side portion of the light exit surface of the light guide plate, there is disposed a regulating member that has light shielding properties and restricts the light guide plate from moving in the thickness direction of the light guide plate. A backlight device characterized by.
  2. 　前記発光素子、前記導光板および前記光学シートを収納するフレームと、
    　前記表示パネルを前記フレームに固定するための接着部材とをさらに備え、
    　前記規制部材は、前記接着部材に接着されていることを特徴とする請求項１に記載のバックライト装置。     A frame that houses the light emitting element, the light guide plate, and the optical sheet;
    An adhesive member for fixing the display panel to the frame;
    The backlight device according to claim 1, wherein the regulating member is bonded to the adhesive member.
  3. 　前記発光素子、前記導光板および前記光学シートを収納する樹脂製のフレームをさらに備え、
    　前記規制部材は、前記フレームに一体的に形成されていることを特徴とする請求項１に記載のバックライト装置。     A resin frame that houses the light emitting element, the light guide plate, and the optical sheet;
    The backlight device according to claim 1, wherein the restricting member is formed integrally with the frame.
  4. 　前記規制部材は、前記光学シートに固定されていることを特徴とする請求項１に記載のバックライト装置。 2. The backlight device according to claim 1, wherein the regulating member is fixed to the optical sheet.
  5. 　前記光学シートは、前記導光板の光出射面に接するように配置される拡散シートを含み、
    　前記規制部材は、前記拡散シートに固定されていることを特徴とする請求項４に記載のバックライト装置。     The optical sheet includes a diffusion sheet disposed so as to be in contact with the light emitting surface of the light guide plate,
    The backlight device according to claim 4, wherein the regulating member is fixed to the diffusion sheet.
  6. 　前記規制部材は、前記導光板の光入射面および光出射面の前方に配置される幅広シート部材と、前記導光板の光出射面の前方に配置される幅狭シート部材とが接着されることにより形成されていることを特徴とする請求項１に記載のバックライト装置。 The regulating member is formed by bonding a wide sheet member disposed in front of the light incident surface and the light emitting surface of the light guide plate and a narrow sheet member disposed in front of the light output surface of the light guide plate. The backlight device according to claim 1, wherein the backlight device is formed by:
  7. 　前記発光素子、前記導光板および前記光学シートを収納するフレームをさらに備え、
    　前記フレームは、前記規制部材の幅広シート部材が前記幅広シート部材の面方向に移動するのを抑制する機能を有することを特徴とする請求項６に記載のバックライト装置。     A frame that houses the light emitting element, the light guide plate, and the optical sheet;
    The backlight device according to claim 6, wherein the frame has a function of suppressing movement of the wide sheet member of the restricting member in a surface direction of the wide sheet member.
  8. 　前記規制部材は、光を反射する機能を有することを特徴とする請求項１に記載のバックライト装置。 2. The backlight device according to claim 1, wherein the regulating member has a function of reflecting light.
  9. 　前記発光素子、前記導光板および前記光学シートを収納するフレームと、
    　前記表示パネルを前記フレームに固定するための接着部材とをさらに備え、
    　前記接着部材の少なくとも一部は、前記導光板の光入射面の前方に配置されており、
    　前記導光板の光出射面または前記光学シートと前記規制部材との間の距離は、前記導光板の前記光入射面側の部分と前記接着部材との間の距離よりも小さいことを特徴とする請求項１に記載のバックライト装置。     A frame that houses the light emitting element, the light guide plate, and the optical sheet;
    An adhesive member for fixing the display panel to the frame;
    At least a part of the adhesive member is disposed in front of the light incident surface of the light guide plate,
    The distance between the light exit surface of the light guide plate or the optical sheet and the regulating member is smaller than the distance between the light incident surface side portion of the light guide plate and the adhesive member. The backlight device according to claim 1.
  10. 　前記発光素子は、発光チップと、前記発光チップを収納する凹部を有するパッケージ本体部と、前記発光チップを覆うように前記パッケージ本体部の凹部に充填される充填材とを含み、
    　前記導光板の光入射面は、前記パッケージ本体部の凹部よりも前方の位置まで形成されていることを特徴とする請求項１に記載のバックライト装置。     The light emitting element includes a light emitting chip, a package main body having a concave portion for housing the light emitting chip, and a filler filled in the concave portion of the package main body so as to cover the light emitting chip,
    2. The backlight device according to claim 1, wherein the light incident surface of the light guide plate is formed to a position ahead of the concave portion of the package main body.
  11. 　請求項１～１０のいずれか１項に記載のバックライト装置と、
    　前記バックライト装置により照明される表示パネルとを備えることを特徴とする表示装置。     The backlight device according to any one of claims 1 to 10,
    A display device comprising a display panel illuminated by the backlight device.
PCT/JP2009/059038 2008-08-29 2009-05-15 Backlight device and display device provided with the same WO2010023996A1 (en)

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RU2011111716/07A RU2475671C2 (en) 2008-08-29 2009-05-15 Backlight device and display device fitted with said backlight device
EP09809651.4A EP2306071A4 (en) 2008-08-29 2009-05-15 Backlight device and display device provided with the same
US13/054,574 US8579490B2 (en) 2008-08-29 2009-05-15 Backlight device and display device provided with the same
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RU2475671C2 (en) 2013-02-20

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